[glibmm] Glib::Checksum, DateTime, TimeZone: Add #include <glibmm/value.h>

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 281ebe7d403b4446eb7f733aa35348ace85b1a6e
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Apr 26 16:55:35 2019 +0200

    Glib::Checksum, DateTime, TimeZone: Add #include <glibmm/value.h>
    
    Should have been done in the previous commit.

 glib/src/checksum.hg | 1 +
 glib/src/datetime.hg | 1 +
 glib/src/timezone.hg | 1 +
 3 files changed, 3 insertions(+)
---
diff --git a/glib/src/checksum.hg b/glib/src/checksum.hg
index 25a8ec04..2bb8e580 100644
--- a/glib/src/checksum.hg
+++ b/glib/src/checksum.hg
@@ -16,6 +16,7 @@
 
 _DEFS(glibmm,glib)
 
+#include <glibmm/value.h>
 #include <glib.h>
 #include <string>
 
diff --git a/glib/src/datetime.hg b/glib/src/datetime.hg
index c18a35c4..8bd3711c 100644
--- a/glib/src/datetime.hg
+++ b/glib/src/datetime.hg
@@ -19,6 +19,7 @@ _DEFS(glibmm,glib)
 #include <glibmmconfig.h>
 #include <glibmm/timezone.h>
 #include <glibmm/ustring.h>
+#include <glibmm/value.h>
 #include <glib.h>
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
diff --git a/glib/src/timezone.hg b/glib/src/timezone.hg
index df4372fd..1d94ba01 100644
--- a/glib/src/timezone.hg
+++ b/glib/src/timezone.hg
@@ -18,6 +18,7 @@ _DEFS(glibmm,glib)
 
 #include <glibmmconfig.h>
 #include <glibmm/ustring.h>
+#include <glibmm/value.h>
 #include <glib.h>
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS