[gnome-builder] patternspec: define _GNU_SOURCE for strcasestr

[Christian Hergert <chergert src gnome org>]

commit 5f35db7e422123063ebf6031718cb46217bbdf87
Author: Christian Hergert <christian hergert me>
Date:   Sun Mar 29 15:39:39 2015 -0700

    patternspec: define _GNU_SOURCE for strcasestr

 libide/ide-pattern-spec.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libide/ide-pattern-spec.c b/libide/ide-pattern-spec.c
index 4507842..b925a90 100644
--- a/libide/ide-pattern-spec.c
+++ b/libide/ide-pattern-spec.c
@@ -18,6 +18,9 @@
 
 #define G_LOG_DOMAIN "ide-pattern-spec"
 
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include <string.h>
 
 #include "ide-pattern-spec.h"