t9157-*.sh: Add an svn version check

Acked-by: Eric Wong <normalperson@yhbt.net>
Acked-by: Steven Walter <stevenrwalter@gmail.com>
Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

t/t9157-git-svn-fetch-merge.sh

@@ -6,6 +6,14 @@
 test_description='git svn merge detection'
 . ./lib-git-svn.sh
 
+svn_ver="$(svn --version --quiet)"
+case $svn_ver in
+[0-1].[0-4].[0-6])
+	skip_all="skipping git-svn test - SVN too old ($svn_ver)"
+	test_done
+	;;
+esac
+
 test_expect_success 'initialize source svn repo' '
 	svn_cmd mkdir -m x "$svnrepo"/trunk &&
 	svn_cmd mkdir -m x "$svnrepo"/branches &&