Log Message:
Changes 4.75.2:
* fixed: corrupt mono or multichannel files created with assembly code (rare)
* fixed: building on Clang systems like Darwin and FreeBSD (req. Clang 3.5+)
* fixed: explicitly sign-extend audio data (< 4-byte) to avoid corrupt files
* fixed: rare decoding errors due to integer overflow (ARM assembly code)
* added: assembly optimizations for "extra" mode on mono or multichannel