MJPEG Tools Svn

Fix typos in header guard macros

Some systems need SDL_CFLAGS (most systems build fine without the flags)

Incorrect macro defined as the header guard

Remove obsolete (and unused) DGA/Xxf86dga logic

Do not need 2nd check of v4l - the 2nd one also generated a v4l warning on non-linux systems

Finish kicking PROGRAM_NOPIC - no references/uses were remaining.

Don't need cpuinfo.c since it was used by cpuinfo.sh which has been removed.

If folks really want to play with "optimizing" for a specific cpu they can use
--with-extra-cflags="-mtune=xxxx" and try various values for xxxx

Remove cpuinfo.sh as both obsolete and not necessary. It turns out that
specifying -mcpu and -march makes no difference in the case of the encoder
(mpeg2enc). If giving the flags for one of the most cpu intense programs in
mjpegtools makes no difference then the cpuinfo.sh script should be removed.

Compiling mpeg2enc with -mtune=core2, corei7, generic and none (no flags at all)
and then encoding 10000 frames produced these times:

core2 118.318u 6.571s 2:05.61 99.4% 0+0k 5+43io 0pf+0w
corei7 118.831u 6.539s 2:05.63 99.7% 0+0k 2+24io 0pf+0w
generic 118.462u 6.571s 2:05.26 99.8% 0+0k 0+24io 0pf+0w
none 118.714u 6.597s 2:05.77 99.6% 0+0k 0+73io 0pf+0w

cpuinfo.sh has been removed from mjpegtools.

-tried to make this bitstreaming a bit quicker (~ 1% gained), but needs rewrite/ABI change to gain speed

- added subtitle stream as own enum
- clean up local variables
- bugfix: subtitles exeeding a pack won't segfault mplex any more