[glib] gtestutils: Add missing include

[Philip Withnall <pwithnall src gnome org>]

commit 6a597f93f6861b5b01b6b45d9b530da4c252b982
Author: Philip Withnall <withnall endlessm com>
Date:   Wed Dec 13 12:03:52 2017 +0000

    gtestutils: Add missing include
    
    memcmp() is used, which is declared in string.h. Include that.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791532

 glib/gtestutils.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/glib/gtestutils.h b/glib/gtestutils.h
index 226a2e8..1d05b97 100644
--- a/glib/gtestutils.h
+++ b/glib/gtestutils.h
@@ -27,6 +27,7 @@
 #include <glib/gstring.h>
 #include <glib/gerror.h>
 #include <glib/gslist.h>
+#include <string.h>
 
 G_BEGIN_DECLS