[binutils-gdb] remote: Eliminate remote_hostio_close_cleanup

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 440b7aece49b9a1e9ff4537214134c3cd06425d9 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: 440b7aece49b9a1e9ff4537214134c3cd06425d9

remote: Eliminate remote_hostio_close_cleanup

gdb/ChangeLog:
2018-05-22  Pedro Alves  <palves@redhat.com>

	* remote.c (remote_hostio_close_cleanup): Delete.
	(class scoped_remote_fd): New.
	(remote_file_put, remote_file_get): Use it.