libsndfile: update to 1.0.30.

Version 1.0.30 (2020-09-18)

  * Fix critical CMake bug with broken ABI of shared libsndfile library.
  * CMake build system considered to be stable.
  * Move sndfile.h.in from src/ to include/ directory. To avoid problems,
    delete old generated sndfile.h from $(top_builddir)/src.
  * Huge documentation update.
  * Fix opus test failures on BE platforms, thanks to
    Arthur Taylor <art@ified.ca>.
  * Fix bug when sf_open_fd() function sometimes leaves filehandle open, even
    if `close_desc` parameter is TRUE, thanks to @uml辰ute.
  * Fix infinite loops on some pathological SD2 files, thanks to
    Jeremy Friesner <jaf@meyersound.com>.
  * Switch to GitHub Actions for continuous integration.
  * Add OSS-Fuzz tests to GitHub Actions workflow, thanks to
    Max Dymond <cmeister2@gmail.com>.
  * Fix memory leak in wavlike_read_bext_chunk() function, credit to OSS-Fuzz.
  * Fix undefined behavior in avr-read_header() function, credit to OSS-Fuzz.
  * Add INSTALL_PKGCONFIG_MODULE CMake option to control sndfile.pc file
    installation, see README.md for details.
  * Add INSTALL_MANPAGES CMake option, see README.md for details.
  * Fix ENABLE_COMPATIBLE_LIBSNDFILE_NAME CMake option, now it works on MinGW
    platform too.
  * Fix ENABLE_CPACK CMake option, see README.md for details.
  * Fix ENABLE_STATIC_RUNTIME and CMAKE_MSVC_RUNTIME_LIBRARY behavior, see
    README.md for details.
  * Fix CMake man pages installation bug when sndfile-deinterleave.1 and
    sndfile-metadata-set.1 were not installed.
  * Fix sndfile-regtest paths handling on Windows platform, thanks to
    Gisle Vanem <gvanem@yahoo.no>.


(wiz)