configure.in : Add AM_PROG_CC_C_O to prevent autogen.sh warning.
configure.in : Add AM_PROG_CC_C_O to prevent autogen.sh warning.

svn path=/trunk/ogg/; revision=15410

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