[gimp/meson: 7/9] Add include guard for windows

[Félix Piédallu <fpiedallu src gnome org>]

commit 3f537e90078b2a81d2d44f3fc62bd0d762559a6a
Author: Félix Piédallu <felix piedallu me>
Date:   Mon Feb 12 23:52:14 2018 +0100

    Add include guard for windows

 libgimpbase/gimputils.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libgimpbase/gimputils.c b/libgimpbase/gimputils.c
index 568346e..7929ef0 100644
--- a/libgimpbase/gimputils.c
+++ b/libgimpbase/gimputils.c
@@ -25,7 +25,9 @@
 #include <string.h>
 #include <stdio.h>
 
+#ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
+#endif
 
 #ifdef PLATFORM_OSX
 #include <AppKit/AppKit.h>