[PATCH] unexport do_exit()

I exported this because vmware needs it.

Petr has updated the vmware wrapper to open-code the sys_exit() trap so this
export is no longer needed.

The updated vmware wrapper is available at

http://platan.vc.cvut.cz/ftp/pub/vmware/vmware-any-any-update50.tar.gz

kernel/exit.c

@@ -794,7 +794,6 @@ NORET_TYPE void do_exit(long code)
 	/* Avoid "noreturn function does return".  */
 	for (;;) ;
 }
-EXPORT_SYMBOL(do_exit);
 
 NORET_TYPE void complete_and_exit(struct completion *comp, long code)
 {