Revert "[WebAudio] build fixes"

This reverts commit 8bb9b335d9e64e8d4b8ca98e720c8b7556a4ec27.
Revert "[WebAudio][GStreamer] Disable FFT size check ASSERT"

This reverts commit d6f9d2e7e13703124f2b23483d72451614bd2bfd.
Revert "[WebAudio] Process each HRTF database channel in a single FFT"

This reverts commit fb94e419bbb9e44a9a2b32ecbc14442f184125d3.