[pushed 17/28] Windows gdb: Enable "set scheduler-locking on"

[Pedro Alves <pedro@palves.net>]

Surprisingly (to me), enabling scheduler locking on Windows currently
fails:

 (gdb)
 set scheduler-locking on
 Target 'native' cannot support this command.

The backend itself does support scheduler-locking.  This patch
implements windows_nat_target::get_thread_control_capabilities so that
the core knows schedlocking works for this target.

Approved-By: Tom Tromey <tom@tromey.com>
Change-Id: Ie762d3768fd70e4ac398c8bcc03c3213bfa26a6a
---
 gdb/windows-nat.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gdb/windows-nat.h b/gdb/windows-nat.h
index 221ce58a887..0f586cd195e 100644
--- a/gdb/windows-nat.h
+++ b/gdb/windows-nat.h
@@ -115,6 +115,9 @@ struct windows_nat_target : public inf_child_target
 
   void close () override;
 
+  thread_control_capabilities get_thread_control_capabilities () override
+  { return tc_schedlock; }
+
   void attach (const char *, int) override;
 
   bool attach_no_wait () override
-- 
2.53.0