$NetBSD: patch-Makefile,v 1.1 2023/11/27 03:21:00 thorpej Exp $

Allow the git revision to be overridden.

--- Makefile.orig	2023-11-06 03:34:39
+++ Makefile	2023-11-27 03:12:47
@@ -336,10 +336,16 @@ $(GIT_SIGNATURE): FORCE
 	rm -rf $(BUILD_DIR)
 	$(MAKE) -C codex clean
 
+ifdef GIT_REV
+$(GIT_SIGNATURE): FORCE
+	@mkdir -p $(BUILD_DIR)
+	/bin/echo -n ${GIT_REV} | tr '[:lower:]' '[:upper:]' > $(GIT_SIGNATURE)
+else
 $(GIT_SIGNATURE): FORCE
 	@mkdir -p $(BUILD_DIR)
 	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: