[glib] Fix the build

[Matthias Clasen <matthiasc src gnome org>]

commit d102cf2b0fbab27d5787c536311745c4431d05e4
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 19 08:57:43 2014 -0500

    Fix the build
    
    The thumbnail-verification test (indirectly) includes individual
    headers, so define GIO_COMPILATION to make it work.

 gio/tests/thumbnail-verification.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gio/tests/thumbnail-verification.c b/gio/tests/thumbnail-verification.c
index 6ccf48d..c9f51c8 100644
--- a/gio/tests/thumbnail-verification.c
+++ b/gio/tests/thumbnail-verification.c
@@ -22,6 +22,7 @@
  * Author: Philip Withnall <philip withnall collabora co uk>
  */
 
+#define GIO_COMPILATION 1
 #include "../thumbnail-verify.c"
 
 static void