x86, um: remove dead header (uml module-generic.h; never used these days)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/um/include/asm/module-generic.h

-#ifndef __UM_MODULE_GENERIC_H
-#define __UM_MODULE_GENERIC_H
-
-#include "asm/arch/module.h"
-
-#endif