forbid extra arguments

aacdec, m4adec: ignore -s argument

add audio/m4adec

print usage to stderr

plan9: waitpid()

add top mkfile

do not install libfaad, build arch-specific archive and use it in the header file instead

Merge remote-tracking branch 'upstream/master' into master

Merge pull request #63 from awesie/awesie-fix-1

Fix various issues

Fix PNS decoding when only right channel is noise.

Fixes #53.

Support implicit SBR signaling in frontend.

Support object type 29.

Samples from https://www2.iis.fraunhofer.de/AAC/stereo.html.

Restrict SBR frame length to 960 and 1024 samples.

Fixes #59 and #60.

Check return value of ltp_data.

Fixes #62.

damn kencc...

audio/aacdec: fix usage

audio/aacdec: remove unused stuff

frontend: provide audio/aacdec

Merge remote-tracking branch 'upstream' into master

Merge pull request #61 from argilo/clean-formatting

Remove non-ASCII characters and trailing whitespace from source files