[gobject-introspection] girffi.c: Don't include unistd.h unconditionally

[Colin Walters <walters src gnome org>]

commit b28cf37dbfe2182dd18daaccc1f6bda66dd92560
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Jul 24 15:56:59 2012 +0800

    girffi.c: Don't include unistd.h unconditionally
    
    It does not exist on all platforms
    
    https://bugzilla.gnome.org/show_bug.cgi?id=681820

 girepository/girffi.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/girepository/girffi.c b/girepository/girffi.c
index ec710c3..f4c80ea 100644
--- a/girepository/girffi.c
+++ b/girepository/girffi.c
@@ -26,7 +26,9 @@
 
 #include <errno.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include "girffi.h"
 #include "girepository.h"
 #include "girepository-private.h"