From: Xian Wang <dev@xianwang.io>
Make the Makefile conform to ebuild installation convention

--- a/Makefile
+++ b/Makefile
@@ -76,7 +76,7 @@ all: corefreqd corefreq-cli
 	$(MAKE) -j1 -C $(KERNELDIR) M=$(PWD) modules
 
 .PHONY: install
-install: module-install
+install:
 	install -Dm 0755 corefreq-cli corefreqd -t $(PREFIX)/bin
 	install -Dm 0644 corefreqd.service \
 		$(PREFIX)/lib/systemd/system/corefreqd.service