Fixed to compile on Mac OS X 10.8 with XCode 4.6

Upodated to compile on Mac OS X 10.8 with XCode 4.6 with command line
tools downloaded. The command line tools couldn't tolerate compiling
the final .c file and linking with the other files. I had to modify the
Makefile to compile all .c files then go back and link the .o files
together into the executable.

Author: scotty1024

Makefile

@@ -27,7 +27,8 @@ lpcterm.o: lpcterm.c $(GLOBAL_DEP)
 	$(CC) $(CDEBUG) $(CFLAGS) -c -o lpcterm.o lpcterm.c
 
 lpc21isp: lpc21isp.c adprog.o lpcprog.o lpcterm.o $(GLOBAL_DEP)
-	$(CC) $(CDEBUG) $(CFLAGS) -o lpc21isp lpc21isp.c adprog.o lpcprog.o lpcterm.o
+	$(CC) $(CDEBUG) $(CFLAGS) -c -o lpc21isp.o lpc21isp.c
+	$(CC) -o lpc21isp lpc21isp.o adprog.o lpcprog.o lpcterm.o
 
 clean:
 	$(RM) adprog.o lpcprog.o lpcterm.o lpc21isp