setlocalversion: add some more fallbacks for git describe

If working out of a custom git tree that lacks annotated tags, the
'git describe' operation spews "fatal: cannot describe" errors all
over the place.  So add some fallback code in case the best naming
was unable to locate something useful.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

tools/setlocalversion

@@ -13,7 +13,8 @@ if head=`git rev-parse --verify HEAD 2>/dev/null`; then
 	# Do we have an untagged version?
 	if git name-rev --tags HEAD | \
 	   grep -E '^HEAD[[:space:]]+(.*~[0-9]*|undefined)$' > /dev/null; then
-	        git describe | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
+	        (git describe || git describe --tags || git describe --all --long) \
+				2>/dev/null | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
 	fi
 
 	# Are there uncommitted changes?