- add symbol BX_GDBSTUB that enables gdb stub

bochs/config.h.in

@@ -261,6 +261,8 @@
 // Leave this 0 unless you have a reason to use it.
 #define BX_PORT_E9_HACK 0
 
+#define BX_GDBSTUB 0
+
 // This option enables "split hard drive" support, which means
 // that a series of partial hard disk images can be treated
 // as a single large image.  If you set up the partition sizes and