mingw32: FFmpeg now passes -fno-common automatically.

Originally committed as revision 18510 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/general.texi

@@ -697,7 +697,7 @@ are listed below:
 @item mingw-runtime 3.15
 @end itemize
 
-You will also need to pass @code{-fno-common} to the compiler to work around
+FFmpeg automatically passes @code{-fno-common} to the compiler to work around
 a GCC bug (see @url{http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216}).
 
 Within the MSYS shell, configure and make with: