Merge commit 'ab81f24a'

* commit 'ab81f24a':
  build: Integrate multilibrary examples into the build system

Conflicts:
	configure
	doc/Makefile
	doc/examples/muxing.c
	doc/examples/output.c
	libavformat/Makefile
	libavformat/output-example.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>