lm4flash Makefile: CFLAGS must come before the source file name

Otherwise include paths aren't neccessarily found by the compiler.

Makefile

@@ -6,7 +6,7 @@ LDFLAGS := $(shell pkg-config --libs libusb-1.0)
 all: $(EXE)
 
 $(EXE): $(EXE).c
-	gcc $^ $(CFLAGS) $(LDFLAGS) -o $@
+	gcc $(CFLAGS) $^ $(LDFLAGS) -o $@
 
 clean:
 	rm -f *.o $(EXE)