all: add flag -dirty to the git version

if the repo is not all checked in, we will append the -dirty flag
to the git hash in the build string

Signed-off-by: Kieran Levin <ktl@frame.work>

Author: kiram9

Makefile

@@ -5,7 +5,7 @@ COSMOCC=../cosmopolitan
 gpu_cfg_generator.exe: gpu_cfg_generator
 	cp gpu_cfg_gen gpu_cfg_gen.exe
 
-GIT_HASH := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
+GIT_HASH := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")$(shell git diff --quiet && git diff --cached --quiet || echo "-dirty")
 
 gpu_cfg_generator: gpu_cfg_generator.c gpu_cfg_generator.h
 	$(COSMOCC)/bin/cosmocc -o gpu_cfg_gen *.c -I ./ -DGIT_HASH=\"$(GIT_HASH)\"