[glib] resolver: Fix compilation

[Bastien Nocera <hadess src gnome org>]

commit 2e26893bf8ea665d8956725c1a30f8d0f91760b4
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jan 3 16:26:38 2017 +0100

    resolver: Fix compilation
    
    Problem introduced in commit 442b7ce.

 gio/gresolver.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gio/gresolver.c b/gio/gresolver.c
index 3b4f174..0ed7d8f 100644
--- a/gio/gresolver.c
+++ b/gio/gresolver.c
@@ -29,6 +29,7 @@
 #include "gtask.h"
 #include "gsrvtarget.h"
 #include "gthreadedresolver.h"
+#include "gioerror.h"
 
 #ifdef G_OS_UNIX
 #include <sys/stat.h>