[gobject-introspection] Don't unconditionally include config.h in regress.c

[Matthias Clasen <matthiasc src gnome org>]

commit 578eebd54bd9f2b1677922680701c454f489c895
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 10 11:36:23 2014 -0400

    Don't unconditionally include config.h in regress.c
    
    This is an installed file, so we can't assume that config.h
    will be around.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737275

 tests/scanner/regress.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/tests/scanner/regress.c b/tests/scanner/regress.c
index 3d3cfdd..8a0652f 100644
--- a/tests/scanner/regress.c
+++ b/tests/scanner/regress.c
@@ -1,5 +1,8 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* This file gets installed, so we can't assume config.h is available */
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
 
 #include <string.h>
 #include <stdlib.h>