$NetBSD: patch-Makefile,v 1.2 2024/04/21 19:56:10 thorpej Exp $

Allow the git revision to be overridden.

--- Makefile.orig	2024-04-21 19:28:08.260002442 +0000
+++ Makefile	2024-04-21 19:29:10.060382341 +0000
@@ -352,8 +352,12 @@ clean:
 
 $(GIT_SIGNATURE): FORCE
 	@mkdir -p $(BUILD_DIR)
+ifdef GIT_REV
+	/bin/echo -n ${GIT_REV} | tr '[:lower:]' '[:upper:]' > $(GIT_SIGNATURE)
+else
 	git diff --quiet && /bin/echo -n $$( (git rev-parse --short=8 HEAD || /bin/echo "00000000") | tr '[:lower:]' '[:upper:]') > $(GIT_SIGNATURE) \
 	|| /bin/echo -n $$( /bin/echo -n $$(git rev-parse --short=7 HEAD || echo "0000000") | tr '[:lower:]' '[:upper:]'; /bin/echo -n '+') > $(GIT_SIGNATURE)
+endif
 
 FORCE: