[glibmm] Remove unused containers.[h||cc].

[Murray Cumming <murrayc src gnome org>]

commit 8c37e116a6a3a862b7574fa607cf69b3b6267dfe
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 20 10:04:11 2017 +0100

    Remove unused containers.[h||cc].

 glib/glibmm/containers.h |  360 ----------------------------------------------
 glib/glibmm/filelist.am  |    2 -
 glib/src/optiongroup.ccg |    1 -
 3 files changed, 0 insertions(+), 363 deletions(-)
---
diff --git a/glib/glibmm/filelist.am b/glib/glibmm/filelist.am
index 76ed885..10964e6 100644
--- a/glib/glibmm/filelist.am
+++ b/glib/glibmm/filelist.am
@@ -7,7 +7,6 @@ glibmm_files_built_ph = $(patsubst %.hg,private/%_p.h,$(glibmm_files_used_hg))
 glibmm_files_extra_cc =                        \
        base64.cc                       \
        class.cc                        \
-       containers.cc                   \
        debug.cc                        \
        dispatcher.cc                   \
        error.cc                        \
@@ -41,7 +40,6 @@ glibmm_files_extra_h =                        \
        base64.h                        \
        class.h                         \
        containerhandle_shared.h        \
-       containers.h                    \
        debug.h                         \
        dispatcher.h                    \
        error.h                         \
diff --git a/glib/src/optiongroup.ccg b/glib/src/optiongroup.ccg
index 37a815d..81d924b 100644
--- a/glib/src/optiongroup.ccg
+++ b/glib/src/optiongroup.ccg
@@ -19,7 +19,6 @@
 #include <glibmm/optioncontext.h>
 #include <glibmm/utility.h>
 #include <glibmm/exceptionhandler.h>
-//#include <glibmm/containers.h>
 #include <glib.h> // g_malloc
 #include <cstring> // std::memset()