MJPEG Tools Svn

o Fix mailing list name ("@lists.sourceforge.net").
o Ensure --with-quicktime and --with-dv default to 'on'.
o Remove --with-dv-yv12 option.
o Various quoting ([,]) cleanups.
o Caching of PRID64_STRING_FORMAT.
o Remove oddball host/build typing. (Stick to $host, etc.)
o Remove IRIX bits.
o Remove GLIB bits.
o Clean-up libquicktime check.
o Use pkg-config for libpng, libdv.
o Clean up __progname check/caching.
o Clean up GTK, SDL checks.
o Remove BUILD_MJPEG.
o Remove definition of VERSION (since automake already does this).
o Remove mjpegtools-config.