Add checksum to build/janet.c to check for inconsistent builds.
@@ -150,6 +150,7 @@ build/janet_boot: $(JANET_BOOT_OBJECTS)
# Now the reason we bootstrap in the first place
build/janet.c: build/janet_boot src/boot/boot.janet
build/janet_boot . JANET_PATH '$(JANET_PATH)' JANET_HEADERPATH '$(INCLUDEDIR)/janet' > $@
+ cksum $@
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