git-version-gen: Check first for new tag format

Tags starting with "v*" are old ones. We first want to check for the new
ones, otherwise the wrong tag is selected as the last one.

Change-Id: Ic39bed2fcf7e3ccb6a83e2999d29d129e07c1a84

git-version-gen

@@ -93,8 +93,8 @@ if test -n "$v"
 then
     : # use $v
 elif
-       v=`git describe --abbrev=4 --match='v*' HEAD 2>/dev/null \
-	  || git describe --abbrev=4 HEAD 2>/dev/null` \
+       v=`git describe --abbrev=4 HEAD 2>/dev/null \
+	  || git describe --abbrev=4 --match='v*' HEAD 2>/dev/null` \
     && case $v in
 	 [0-9]*) ;;
 	 v[0-9]*) ;;