Check that the compiler supports -mv8 before adding it to the command  line on sun sparc. Issue #1458.
Check that the compiler supports -mv8 before adding it to the command 
line on sun sparc. Issue #1458.

I haven't recieved confirmation this resolves the issue, but I don't see 
how it can do much harm.

svn path=/trunk/vorbis/; revision=15746

ShiftMediaProject/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,youfearm3/vorbis,mwgoldsmith/vorbis,felipebetancur/vorbis,nicolaichuk/vorbis,erikd/vorbis,mwgoldsmith/vorbis,emscripten-ports/Vorbis,ShiftMediaProject/vorbis,erikd/vorbis,nicolaichuk/vorbis,eidy/vorbis,ShiftMediaProject/vorbis,youfearm3/vorbis,nicolaichuk/vorbis,felipebetancur/vorbis,felipebetancur/vorbis,eidy/vorbis,ksophocleous/vorbis,youfearm3/vorbis,nicolaichuk/vorbis,erikd/vorbis,ksophocleous/vorbis,youfearm3/vorbis,ShiftMediaProject/vorbis,eidy/vorbis,eidy/vorbis,erikd/vorbis,emscripten-ports/Vorbis,ShiftMediaProject/vorbis,emscripten-ports/Vorbis,mwgoldsmith/vorbis,emscripten-ports/Vorbis,mwgoldsmith/vorbis,ksophocleous/vorbis,ksophocleous/vorbis