minor Makefile cleaning

Makefile

@@ -1,14 +1,14 @@
 TARGET:=hl
 
-CFLAGS:=-std=c99 -Wall -Wextra -Wpedantic -Wshadow -Wundef
-CPPFLAGS:=-Iinclude -D_GNU_SOURCE -D_FORTIFY_SOURCE=2
+CFLAGS   := -std=c99
+CPPFLAGS := -Iinclude -D_GNU_SOURCE
 
 DEBUG=1
 
 ifeq (${DEBUG},1)
-	CFLAGS += -Og -ggdb -pg -fno-inline
+	CFLAGS += -Og -ggdb -pg -fno-inline -Wall -Wextra -Wpedantic -Wshadow -Wundef
 else
-	CFLAGS += -O2 -flto=auto
+	CFLAGS += -O2 -flto=auto -D_FORTIFY_SOURCE=2
 endif
 
 PREFIX:=/usr/bin
@@ -17,8 +17,8 @@ USER=$(shell whoami)
 
 include chad.mk
 
-SRC.dir:=source
-OBJ.dir:=object
+SRC.dir := source
+OBJ.dir := object
 
 SRC:=$(shell find ${SRC.dir} -iname '*.c')
 HDR:=$(shell find ${SRC.dir} -iname '*.h')