audio/faust: Update to 2.5.17
Additional changes:
- Updated to llvm-50 (latest possible version)
- Added GH_TUPLE for libraries
- Fixed manpage location
- Removed the stray MacOS static lib under lib/faust/
Testing:
- Compiled and ran several DSP programs.
Next version is expected to be cmake-based.
Reported by: portscout
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D14239