Update FAudio to version 21.09 / rev 15 via SR 919669
    
    https://build.opensuse.org/request/show/919669
    by user msmeissn + dimstar_suse
    - update to 21.09:
      * FACT: Fix a crash from an uninitialized pointer when a WaveBank does not have a name
        table.
      * platform_sdl2: When querying the default device, ignore audio devices with way too many
        channels.
      * platform_win32: Minor Win32 buildfixes
    - update to 21.07:
      * Fix incorrect value for MF_MT_AUDIO_AVG_BYTES_PER_SECOND.
    - update to 21.05:
      * CMake: Add 'Requires' for GStreamer to the pkgconfig file
      * Updated source to github.
    - update to 21.04:
      * Added support for SDL_GetAudioDeviceSpec, coming in a future SDL release
      * FACT: Implemented accurate Fast/Slow/SinCos RPC curve types
      * Added support for XMA2 audio, for Xbox 360 data
      * Voice filters/effects should be processed even when SendCount is 0
      * FACT: Fix parsing/calculation of filter Q factors