Enable CONFIG_FASTDIV by default

Originally committed as revision 17900 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -92,7 +92,7 @@ show_help(){
   echo "  --disable-ipv6           disable IPv6 support [no]"
   echo "  --disable-mpegaudio-hp   faster (but less accurate) MPEG audio decoding [no]"
   echo "  --enable-gray            enable full grayscale support (slower color)"
-  echo "  --enable-fastdiv         enable table-based division"
+  echo "  --disable-fastdiv        disable table-based division"
   echo "  --enable-small           optimize for size instead of speed"
   echo "  --disable-aandct         disable AAN DCT code"
   echo "  --disable-fft            disable FFT code"
@@ -1167,6 +1167,7 @@ host_os=$target_os
 
 # configurable options
 enable debug
+enable fastdiv
 enable ffmpeg
 enable ffplay
 enable ffserver