Sync external/mit/expat to current and pull up the following revisions,
requested by maya in ticket #1376:

external/mit/expat/dist/conftools/test-driver up to 1.1.1.1
external/mit/expat/dist/conftools/ar-lib up to 1.1.1.1
external/mit/expat/dist/conftools/ax-append-compile-flags.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/ax-append-flag.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/ax-append-link-flags.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/ax-check-compile-flag.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/ax-check-link-flag.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/ax-require-defined.m4 up to 1.1.1.1
external/mit/expat/dist/conftools/compile up to 1.1.1.1
external/mit/expat/dist/conftools/depcomp up to 1.1.1.1
external/mit/expat/dist/conftools/missing up to 1.1.1.1
external/mit/expat/dist/conftools/expatcfg-compiler-supports-visibility.m4 up to 1.1.1.1
external/mit/expat/dist/doc/Makefile.am up to 1.1.1.1
external/mit/expat/dist/doc/Makefile.in up to 1.1.1.1
external/mit/expat/dist/examples/Makefile.am up to 1.1.1.1
external/mit/expat/dist/examples/Makefile.in up to 1.1.1.1
external/mit/expat/dist/lib/Makefile.am up to 1.1.1.1
external/mit/expat/dist/lib/Makefile.in up to 1.1.1.1
external/mit/expat/dist/tests/benchmark/Makefile.am up to 1.1.1.1
external/mit/expat/dist/tests/benchmark/Makefile.in up to 1.1.1.1
external/mit/expat/dist/tests/Makefile.am up to 1.1.1.1
external/mit/expat/dist/tests/Makefile.in up to 1.1.1.1
external/mit/expat/dist/tests/structdata.c up to 1.1.1.1
external/mit/expat/dist/tests/structdata.h up to 1.1.1.1
external/mit/expat/dist/tests/udiffer.py up to 1.1.1.1
external/mit/expat/dist/tests/xmltest.log.expected up to 1.1.1.1
external/mit/expat/dist/win32/build_expat_iss.bat up to 1.1.1.1
external/mit/expat/dist/xmlwf/Makefile.am up to 1.1.1.1
external/mit/expat/dist/xmlwf/Makefile.in up to 1.1.1.1
external/mit/expat/dist/xmlwf/xmlwf_helpgen.py up to 1.1.1.1
external/mit/expat/dist/xmlwf/xmlwf_helpgen.sh up to 1.1.1.1
external/mit/expat/dist/Makefile.am up to 1.1.1.1
external/mit/expat/dist/README.md up to 1.1.1.1
external/mit/expat/dist/cmake/expat-config.cmake.in up to 1.1.1.1
external/mit/expat/dist/cmake/mingw-toolchain.cmake up to 1.1.1.1
external/mit/expat/dist/acinclude.m4 up to 1.1.1.1
external/mit/expat/dist/fix-xmltest-log.sh up to 1.1.1.1
external/mit/expat/dist/test-driver-wrapper.sh up to 1.1.1.1
external/mit/expat/dist/MANIFEST delete
external/mit/expat/dist/README delete
external/mit/expat/dist/conftools/ac_c_bigendian_cross.m4 delete
external/mit/expat/dist/conftools/mkinstalldirs delete
external/mit/expat/dist/xmlwf/xmlurl.h delete
external/mit/expat/dist/xmlwf/xmlwin32url.cxx delete
external/mit/expat/dist/CMake.README up to 1.1.1.5
external/mit/expat/dist/CMakeLists.txt up to 1.1.1.5
external/mit/expat/dist/Changes up to 1.1.1.6
external/mit/expat/dist/ConfigureChecks.cmake up to 1.1.1.2
external/mit/expat/dist/Makefile.in up to 1.1.1.6
external/mit/expat/dist/aclocal.m4 up to 1.1.1.4
external/mit/expat/dist/configure up to 1.1.1.6
external/mit/expat/dist/configure.ac up to 1.1.1.4
external/mit/expat/dist/expat_config.h.cmake up to 1.1.1.2
external/mit/expat/dist/expat_config.h.in up to 1.1.1.6
external/mit/expat/dist/conftools/config.guess up to 1.4
external/mit/expat/dist/conftools/config.sub up to 1.4
external/mit/expat/dist/conftools/get-version.sh up to 1.1.1.2
external/mit/expat/dist/conftools/install-sh up to 1.1.1.5
external/mit/expat/dist/conftools/ltmain.sh up to 1.1.1.5
external/mit/expat/dist/doc/reference.html up to 1.1.1.5
external/mit/expat/dist/doc/xmlwf.1 up to 1.1.1.4
external/mit/expat/dist/doc/xmlwf.xml up to 1.1.1.2
external/mit/expat/dist/examples/elements.c up to 1.1.1.5
external/mit/expat/dist/examples/outline.c up to 1.1.1.4
external/mit/expat/dist/lib/ascii.h up to 1.1.1.2
external/mit/expat/dist/lib/asciitab.h up to 1.1.1.2
external/mit/expat/dist/lib/expat.h up to 1.1.1.6
external/mit/expat/dist/lib/expat_external.h up to 1.1.1.4
external/mit/expat/dist/lib/iasciitab.h up to 1.1.1.2
external/mit/expat/dist/lib/internal.h up to 1.1.1.3
external/mit/expat/dist/lib/latin1tab.h up to 1.1.1.2
external/mit/expat/dist/lib/libexpat.def up to 1.1.1.3
external/mit/expat/dist/lib/libexpatw.def up to 1.1.1.3
external/mit/expat/dist/lib/nametab.h up to 1.1.1.2
external/mit/expat/dist/lib/siphash.h up to 1.1.1.2
external/mit/expat/dist/lib/utf8tab.h up to 1.1.1.2
external/mit/expat/dist/lib/winconfig.h up to 1.1.1.3
external/mit/expat/dist/lib/xmlparse.c up to 1.8
external/mit/expat/dist/lib/xmlrole.c up to 1.1.1.5
external/mit/expat/dist/lib/xmlrole.h up to 1.1.1.2
external/mit/expat/dist/lib/xmltok.c up to 1.5
external/mit/expat/dist/lib/xmltok.h up to 1.3
external/mit/expat/dist/lib/xmltok_impl.c up to 1.6
external/mit/expat/dist/lib/xmltok_impl.h up to 1.1.1.2
external/mit/expat/dist/lib/xmltok_ns.c up to 1.1.1.2
external/mit/expat/dist/tests/chardata.c up to 1.1.1.4
external/mit/expat/dist/tests/chardata.h up to 1.1.1.2
external/mit/expat/dist/tests/memcheck.c up to 1.1.1.2
external/mit/expat/dist/tests/memcheck.h up to 1.1.1.2
external/mit/expat/dist/tests/minicheck.c up to 1.1.1.4
external/mit/expat/dist/tests/minicheck.h up to 1.1.1.5
external/mit/expat/dist/tests/runtests.c up to 1.1.1.5
external/mit/expat/dist/tests/runtestspp.cpp up to 1.1.1.2
external/mit/expat/dist/tests/xmltest.sh up to 1.4
external/mit/expat/dist/tests/benchmark/benchmark.c up to 1.1.1.3
external/mit/expat/dist/win32/README.txt up to 1.1.1.5
external/mit/expat/dist/win32/expat.iss up to 1.1.1.6
external/mit/expat/dist/xmlwf/codepage.c up to 1.1.1.4
external/mit/expat/dist/xmlwf/codepage.h up to 1.1.1.2
external/mit/expat/dist/xmlwf/ct.c up to 1.1.1.2
external/mit/expat/dist/xmlwf/filemap.h up to 1.1.1.3
external/mit/expat/dist/xmlwf/readfilemap.c up to 1.1.1.5
external/mit/expat/dist/xmlwf/unixfilemap.c up to 1.1.1.4
external/mit/expat/dist/xmlwf/win32filemap.c up to 1.1.1.3
external/mit/expat/dist/xmlwf/xmlfile.c up to 1.1.1.4
external/mit/expat/dist/xmlwf/xmlfile.h up to 1.1.1.2
external/mit/expat/dist/xmlwf/xmlmime.c up to 1.1.1.2
external/mit/expat/dist/xmlwf/xmlmime.h        up to 1.1.1.2
external/mit/expat/dist/xmlwf/xmltchar.h        up to 1.1.1.2
external/mit/expat/dist/xmlwf/xmlwf.c          up to 1.1.1.6
external/mit/expat/lib/libexpat/expat_config.h  up to 1.6
doc/3RDPARTY 1.1649 (patch)
external/mit/xorg/tools/fc-cache/Makefile 1.18 (patch)

Update expat to 2.2.8.
Define XML_POOR_ENTROPY for the tool version of fc-cache
(we can not assume anything about the build host).

(martin)