Update to version 0.11.10, a bug-fix release.  In addition,
add a 'gen-symfile' target for regenerating the libtool
export symfile.  This should be run upon updating the package.
While here, silence needless autotools warnings and update
sse2 conditional in hacks.mk.

Changes since 0.11.8:

              Add depth 30 formats to pixman_format_supported_source.

              [sse2] Change pixman-sse to pass __mm128i args as
              pointers, so as not to

              Use CopyAreasse2, plus a compatibility fix

              Use hidden attribute for private functions when
              compiling with Sun Studio

              Minor portability fixes
              Post-release version-bump
              Update RELEASING and release targets in Makefile.am
              Fix typo in sse2 configure logic
              TODO
              Don't require GCC 4.2 on x86-64
              Bug 16921. MMX and SSE2 intrinsics not enabled when
              compiling with Intel'
              Remove use of MMX extensions.
              Be consistent in naming SSE2 related things SSE2
              A few other renamings of SSE->SSE2
              Rename pixman-sse.h pixman-sse2.h
              Make sure pixman-combine{32,64}.h are disted
              Use error instead of #error in a couple of other places
              Check for __sun || __sun in pixman.h. Update TODO
              Bump release
              Update RELEASING

              Add sys/inttypes.h include for AIX

(bjs)