MFH: r357872

- Unbreak build with clang
- Update shared lib handling: mp3lame -> libmp3lame.so etc.
- USES libtool
- Stagify
- Pet portlint
  - Makefile cleanup
  - Rename files/patch-include::mpeg4ip_byteswap.h -> get rid of colons
- Bump PORTREVISION

Approved by:	portmgr (swills), mentors (implicit)
Make sysutils/pstree operable in jailed environment.