Dump ppc
Require 10.6
Apparently, for 32-bit LPCM output, the level was set to 2^31 instead of 2^32-1.
Revert previous.  Looked at the reason for the change, and determined the previous code was in fact correct.
Corrected the length passthrough packets.
OS X conditional macros header was moved in 10.9.
Get it working on 10.8 and later.
Merge remote-tracking branch 'mackyle/trunk'

Conflicts:
	A52Codec.xcodeproj/project.pbxproj
Minor changes.