Add support for user overridden CFLAGS and LDFLAGS
diff --git a/cstool/Makefile b/cstool/Makefile
index 450ac1b..3cf2a81 100644
--- a/cstool/Makefile
+++ b/cstool/Makefile
@@ -3,2 +3,3 @@
 include ../functions.mk
+include ../config.mk
 
@@ -8,4 +9,4 @@ LIBNAME = capstone
 
-CFLAGS = -I../include
-LDFLAGS = -O3 -Wall -L.. -l$(LIBNAME)
+CFLAGS += -I../include
+LDFLAGS += -Wall -L.. -l$(LIBNAME)