[mythtv] Compiler Tuning Flags

[Eric Reischer]

Just something I thought I'd pass on.......I had been having a problem of 
Goom and some other CPU-intensive plugins crashing occasionally on my 
machine.  The crash would kill the frontend program without any segfault 
messages or anything.

Just to see if it would make a difference, I changed the flags for the 
entire mythtv (and plugins) compile to include not only "-march=pentium3" 
(since I have one), but to also use the "-msse -mfpmath=sse" flags.  In 
addition to the the crashes going away, everything seemed to respond a lot 
better and overall CPU usage dropped a bit too.  If more people have 
similar results, it might be worthwhile to change the configure script to 
add these flags on supported systems.

~Eric