build: also consider builds off of git with `git clone --depth 1`

one case where this could happen is a shallow clone, purely for build
purposes. in source based distros, like gentoo, setting depth of the
clone to 1, globally, is a common configuration. this patch avoids that
those builds fail.

Signed-off-by: Paymon MARANDI <darwinskernel@gmail.com>

version.sh

@@ -17,12 +17,12 @@ if test -z "$mb"; then
 fi
 if test -z "$mb"; then
 	# still no upstream, so just describe HEAD as-is.
-	gver=$(git describe --tags HEAD)
+	gver=$(git describe --always --tags HEAD)
 else
 	# find out whether we have local work, and if so, collapse it into
 	# a single suffix. otherwise, we'd cause pointless rebuilds during
 	# development.
-	gver=$(git describe --tags $mb)
+	gver=$(git describe --always --tags $mb)
 	lcl=$(git rev-list -n 1 $mb..HEAD)
 	if test -n "$lcl"; then
 		gver="$gver-plus"