fixed .m4 file.  AC_ARG_WITH sets the variable to "NONE" not "".
fixed .m4 file.  AC_ARG_WITH sets the variable to "NONE" not "".

svn path=/trunk/ogg/; revision=1403

mwgoldsmith/ogg,ShiftMediaProject/ogg,emscripten-ports/Ogg,youfearm3/ogg,felipebetancur/ogg,ksophocleous/ogg,eidy/libogg,xiph/ogg,nicolaichuk/ogg,ksophocleous/ogg,youfearm3/ogg,felipebetancur/ogg,ShiftMediaProject/ogg,nicolaichuk/ogg,xiph/ogg,brion/ogg,eidy/libogg,emscripten-ports/Ogg,brion/ogg,mwgoldsmith/ogg