* objcopy.c (use_alt_mach_code): Change type to unsigned long.

* objcopy.c (use_alt_mach_code): Change type to unsigned long.
   (copy_object):  If bfd_alt_mach_code fails emit a more helpful message
   and if the target architecture is ELF use the alternative as replacement
   value for the e_machine number.
   (copy_main): Use strtoul to parse the number provided with the
   --alt-mach-code switch.
* doc/binutils.texi (--alt-mach-code): Document that this switch can now
    set the absolute e_machine value.