extract revision from svn-1.4 .svn/entries files

Originally committed as revision 9362 to svn://svn.ffmpeg.org/ffmpeg/trunk

version.sh

@@ -3,6 +3,7 @@
 svn_revision=`cd "$1" && LC_ALL=C svn info 2> /dev/null | grep Revision | cut -d' ' -f2`
 test $svn_revision || svn_revision=`cd "$1" && grep revision .svn/entries | \
                                     cut -d '"' -f2 2> /dev/null`
+test $svn_revision || svn_revision=`cd "$1" && sed -n '/^dir$/{n;p;q}' < .svn/entries`
 test $svn_revision || svn_revision=UNKNOWN
 
 NEW_REVISION="#define FFMPEG_VERSION \"SVN-r$svn_revision\""