getver.sh: cope with varying "git log" line formats to reliably extract the git-svn rev (#10268)

SVN-Revision: 28604

scripts/getver.sh

@@ -18,7 +18,7 @@ try_svn() {
 
 try_git() {
 	[ -d .git ] || return 1
-	REV="$(git log | grep -m 1 git-svn-id | awk '{ gsub(/.*@/, "", $2); print $2 }')"
+	REV="$(git log | grep -m 1 git-svn-id | awk '{ gsub(/.*@/, "", $0); print $1 }')"
 	REV="${REV:+r$REV}"
 	[ -n "$REV" ]
 }