[binutils-gdb] Make do_is_mi_like_p const.

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 4904c3c6b69d5c7b5e4682220c1d9503e00a457e ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 4904c3c6b69d5c7b5e4682220c1d9503e00a457e

Make do_is_mi_like_p const.

This changes ui_out to make is_mi_like_p and do_is_mi_like_p "const".

ChangeLog
2018-04-30  Tom Tromey  <tom@tromey.com>

	* ui-out.c: Update.
	* cli-out.h (cli_ui_out::do_is_mi_like_p): Update.
	* ui-out.h (ui_out::is_mi_like_p): Now const.
	(ui_out::do_is_mi_like_p): Now const.
	* mi/mi-out.h (mi_ui_out::do_is_mi_like_p): Update.