[glibmm] Remove now-unnecessary includes of glibmm/threads.h.

[Murray Cumming <murrayc src gnome org>]

commit 9f2c5acdc8a058a28d08f4f8ad4105aa9f42df3b
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Nov 27 10:15:46 2015 +0100

    Remove now-unnecessary includes of glibmm/threads.h.

 gio/src/application.ccg   |    1 -
 glib/glibmm/interface.cc  |    1 -
 glib/glibmm/object.cc     |    1 -
 glib/glibmm/objectbase.cc |    1 -
 4 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/gio/src/application.ccg b/gio/src/application.ccg
index e63aef9..26bcb9e 100644
--- a/gio/src/application.ccg
+++ b/gio/src/application.ccg
@@ -22,7 +22,6 @@
 #include <giomm/actiongroup.h>
 #include <giomm/init.h>
 #include <cstring> // std::memset()
-#include <glibmm/threads.h>
 #include <map>
 #include <vector>
 
diff --git a/glib/glibmm/interface.cc b/glib/glibmm/interface.cc
index 52e9bed..be04a50 100644
--- a/glib/glibmm/interface.cc
+++ b/glib/glibmm/interface.cc
@@ -15,7 +15,6 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <glibmm/threads.h> // Needed until the next ABI break.
 #include <glibmm/interface.h>
 #include <glibmm/private/interface_p.h>
 
diff --git a/glib/glibmm/object.cc b/glib/glibmm/object.cc
index d0cf9e1..502e4c8 100644
--- a/glib/glibmm/object.cc
+++ b/glib/glibmm/object.cc
@@ -15,7 +15,6 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <glibmm/threads.h> // Needed until the next ABI break.
 #include <glibmm/object.h>
 #include <glibmm/private/object_p.h>
 #include <glibmm/property.h>
diff --git a/glib/glibmm/objectbase.cc b/glib/glibmm/objectbase.cc
index 9c59ed9..59133ed 100644
--- a/glib/glibmm/objectbase.cc
+++ b/glib/glibmm/objectbase.cc
@@ -15,7 +15,6 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <glibmm/threads.h> // Needed until the next ABI break.
 #include <glib-object.h>
 
 #include <glibmm/quark.h>