[gtksourceviewmm] Add #includes needed with the latest glibmm.

[Murray Cumming <murrayc src gnome org>]

commit ec849dd457b8041b5be9ad526f9d688b86e740c3
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 25 12:21:32 2011 +0200

    Add #includes needed with the latest glibmm.
    
    Add individual includes now that gmmproc does not add #include
    glibmm.h at the top of every generated header.

 gtksourceview/src/completionactivation.hg |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/src/completionactivation.hg b/gtksourceview/src/completionactivation.hg
index 5b826ee..680613f 100644
--- a/gtksourceview/src/completionactivation.hg
+++ b/gtksourceview/src/completionactivation.hg
@@ -19,14 +19,18 @@
 
 _DEFS(gtksourceviewmm,gtksourceview)
 
+#include <glibmm/value.h>
+
 namespace Gsv
 {
+
 // TODO: need docs. krnowak
 /** An enum type specifying something bla bla bla, probably type of activation.
  *
  * @newin{2,10}
  */
 _WRAP_ENUM(CompletionActivation, GtkSourceCompletionActivation, s#^SOURCE_##)
+
  /** @var CompletionActivation COMPLETION_ACTIVATION_NONE
   * None.
   */