[binutils-gdb] Remove a cleanup from remote.c

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 69b6ecb049143078f43a9372b68ac90a4601dc8c ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 69b6ecb049143078f43a9372b68ac90a4601dc8c

Remove a cleanup from remote.c

This removes a cleanup from remote.c by using std::string to construct
the qSupported packet.

Tested by the buildbot.

ChangeLog
2018-05-04  Tom Tromey  <tom@tromey.com>

	* remote.c (remote_query_supported_append): Change type.
	(remote_check_symbols): Update.