gdb/testsuite: Adjust some testcases to allow Windows pathnames

This patch fixes some testcases that formerly had patterns with
hardwired "/" pathname separators in them, which broke when testing on
(remote) Windows host.

Reviewed-By: Tom Tromey <tom@tromey.com>
Approved-By: Tom Tromey <tom@tromey.com>
4 files changed