Support --localedir, --datarootdir and --datadir

bfd/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
binutils/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
gas/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
gold/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
gprof/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
ld/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.
opcodes/
	* po/Make-in (datadir): Define as @datadir@.
	(localedir): Define as @localedir@.
	(gnulocaledir, gettextsrcdir): Use @datarootdir@.