[chore] Makefile: declare all phonies (#875)

It's generally working as expected you're unlikely to have a file named `clean`. But if you were to create a file named `all` or `clean` you could have a pretty difficult time figuring out why nothing's happening anymore. Cf. koreader/koreader#4819 and #871.
koreader · Mar 21, 2019 · 6789285 · 6789285
1 parent 23d8c0b
commit 6789285
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Makefile b/Makefile
@@ -215,4 +215,4 @@ test: $(OUTPUT_DIR)/spec $(OUTPUT_DIR)/.busted
 		--no-auto-insulate \
 		-o ./spec/base/unit/verbose_print ./spec/base/unit
 
-.PHONY: test
+.PHONY: all clean test