Do not modify CFLAGS by default

AMDmi3 · AMDmi3 · commit 613cc12456fe · 2016-09-05T15:21:00.000+03:00
diff --git a/lm4flash/Makefile b/lm4flash/Makefile
@@ -10,9 +10,11 @@ CFLAGS += $(shell pkg-config --cflags libusb-1.0)
 LDFLAGS += $(shell pkg-config --libs libusb-1.0)
 endif
 
-all: CFLAGS += -O2
 all: $(EXE)
 
+release: CFLAGS += -O2
+release: $(EXE)
+
 debug: CFLAGS += -g -DDEBUG
 debug: $(EXE)
 
