[mythtv] Shm detection + frame decimation environment variable

[Thor Johnson]

Another little patch.  The first bit sets the default value of 
use_shm to whether or not the SHM extension is found 
(false for cygwin-XF86).

The second part reads the SKIP environment variable and
displays 1 out of SKIP frames.  On my 100MBit lan, I can
do SKIP=3 mythfrontend, and the video will be ok'ish 
(640x480) using X to do the video rendering.

Basically this lets me develop MythTV from a remote X server
without hassle.

FWIW,
-Thor Johnson
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