[glib] documents portal: Make sure O_PATH is defined

[Matthias Clasen <matthiasc src gnome org>]

commit 63654183a890502fe8d97f6e5d2be23589413a7a
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 13 12:37:11 2016 -0400

    documents portal: Make sure O_PATH is defined
    
    FreeBSD doesn't have it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768780

 gio/gdocumentportal.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gio/gdocumentportal.c b/gio/gdocumentportal.c
index de71cf7..d295300 100644
--- a/gio/gdocumentportal.c
+++ b/gio/gdocumentportal.c
@@ -30,6 +30,10 @@
 #include "gunixfdlist.h"
 #endif
 
+#ifndef O_PATH
+#define O_PATH 0
+#endif
+
 static GXdpDocuments *documents;
 static char *documents_mountpoint;