This fixes building on some broken systems.

Originally committed as revision 21735 to svn://svn.ffmpeg.org/ffmpeg/trunk

These are often, contrary to standards, implemented only as macros
or compiler-builtin functions without an actual symbol definition.

Originally committed as revision 21734 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21733 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21732 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21714 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21713 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21705 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21704 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21703 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21702 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21701 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21700 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21699 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21698 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21697 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21696 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21695 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21694 to svn://svn.ffmpeg.org/ffmpeg/trunk

start and to avoid initializing codecs with missing headers is set for all streams.
Fixes issue 1723.

Originally committed as revision 21693 to svn://svn.ffmpeg.org/ffmpeg/trunk

by KO Myung-Hun <komh challion net>.

Originally committed as revision 21692 to svn://svn.ffmpeg.org/ffmpeg/trunk

11cylcles slower MV generation
98cycles faster MC

Originally committed as revision 21691 to svn://svn.ffmpeg.org/ffmpeg/trunk

as 16x16 (except ones changing interlacing relative to the colocated MB).
20 cycles slower during MV generation
175 cycles faster during MC

Originally committed as revision 21690 to svn://svn.ffmpeg.org/ffmpeg/trunk

19 cycles slower MV generation
575 cycles faster MC

Originally committed as revision 21689 to svn://svn.ffmpeg.org/ffmpeg/trunk

pages that continue packets started in prior pages.
Fixes issue1248

Originally committed as revision 21688 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Wolfram Gloger wmglo (chez) dent med uni (minus) muenchen de

Originally committed as revision 21687 to svn://svn.ffmpeg.org/ffmpeg/trunk

This should speed the affected cases (MBAFF temporal direct MBs) up.

Originally committed as revision 21686 to svn://svn.ffmpeg.org/ffmpeg/trunk

7 cpu cycles faster.

Originally committed as revision 21685 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21684 to svn://svn.ffmpeg.org/ffmpeg/trunk

and simplify cases that cannot happen away.
8 cpu cycles faster

Originally committed as revision 21683 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21682 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21681 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21680 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21679 to svn://svn.ffmpeg.org/ffmpeg/trunk

a bit more than 10 cpu cycles faster.

Originally committed as revision 21678 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21677 to svn://svn.ffmpeg.org/ffmpeg/trunk

number of calls to it down by 2.

Originally committed as revision 21676 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21675 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21674 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21673 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 21672 to svn://svn.ffmpeg.org/ffmpeg/trunk