Simplify quoting.

Originally committed as revision 7823 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1920,7 +1920,7 @@ echo "Creating config.mak and config.h..."
 
 echo "# Automatically generated by configure - do not modify!" > config.mak
 echo "/* Automatically generated by configure - do not modify! */" > $TMPH
-echo "#define FFMPEG_CONFIGURATION "'"'"$FFMPEG_CONFIGURATION"'"' >> $TMPH
+echo "#define FFMPEG_CONFIGURATION \"$FFMPEG_CONFIGURATION\"" >> $TMPH
 
 echo "PREFIX=$PREFIX" >> config.mak
 echo "prefix=\$(DESTDIR)\${PREFIX}" >> config.mak