add clean target, use CC instead of gcc..

Makefile

@@ -4,20 +4,23 @@ LDFLAGS=-g
 
 all: cc_chipid cc_read cc_write cc_erase
 
+clean:
+	rm -f cc_chipid cc_read cc_write cc_erase
+
 cc_erase : cc_erase.o CCDebugger.o
-	gcc $(LDFLAGS) -o $@ $^ $(LDLIBS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
 cc_write : cc_write.o CCDebugger.o
-	gcc $(LDFLAGS) -o $@ $^ $(LDLIBS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
 cc_read : cc_read.o CCDebugger.o
-	gcc $(LDFLAGS) -o $@ $^ $(LDLIBS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
 cc_chipid : cc_chipid.o CCDebugger.o
-	gcc $(LDFLAGS) -o $@ $^ $(LDLIBS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
 cc_chipid.o : cc_chipid.c CCDebugger.h
-	gcc $(CFLAGS) -c $*.c
+	$(CC) $(CFLAGS) -c $*.c
 
 CCDebugger.o : CCDebugger.c CCDebugger.h
-	gcc $(CFLAGS) -c $*.c
+	$(CC) $(CFLAGS) -c $*.c