Revert "lavf/Makefile: fix standalone compilation of live_flv demuxer"

This reverts commit 4c9ee1590febe38e3e4f5fd73bd34300d1e9ec6c.
Revert "avcodec: add simpleauto idct"

This reverts commit 08c5859f17ed6c16d7e59ea63c63d85cc0d9427f.
Revert "configure: Drop duplicate pkg-config entry from help output"

This reverts commit 852c329a69ddfd635807f60454df07d021c64901.

Conflicts:
	configure
Revert "Revert "avcodec: add simpleauto idct""

This reverts commit 7802873a09c99ff681d19af16ec5d001ce725e4a.