Merged a cleaned up version of Jiang's code changes from Google Summer of Code 2009

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403823

build-scripts/showrev.sh

@@ -9,4 +9,7 @@ if [ -d $srcdir/.svn ]; then
     (svnversion -c 2>/dev/null || svnversion .) | \
         sed -e 's,\([0-9]*\)[A-Z]*,\1,' \
             -e 's,[0-9]*:\([0-9]*\)[A-Z]*,\1,'
+else
+     cd $srcdir
+     git svn info | grep Revision | awk '{ print $2 }'
 fi