Fix md5 program invocation for BSD.

patch by Michael Kostylev, michael.kostylev gmail com

Originally committed as revision 20086 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/codec-regression.sh

@@ -38,7 +38,7 @@ target_crcfile="$target_datadir/$this.crc"
 if [ X"`echo | md5sum 2> /dev/null`" != X ]; then
     do_md5sum() { md5sum -b $1; }
 elif [ X"`echo | md5 2> /dev/null`" != X ]; then
-    do_md5sum() { md5 -r $1 | sed 's# \**\./# *./#'; }
+    do_md5sum() { md5 $1 | sed 's#MD5 (\(.*\)) = \(.*\)#\2 *\1#'; }
 elif [ -x /sbin/md5 ]; then
     do_md5sum() { /sbin/md5 -r $1 | sed 's# \**\./# *./#'; }
 else