[gssdp] Include config.h in gssdp-socket-functions.c

[Jens Georg <jensgeorg src gnome org>]

commit e025867476b15b4dab816918d722c2c0d408dfe2
Author: Jussi Kukkonen <jku goto fi>
Date:   Fri Jul 25 12:32:10 2014 +0300

    Include config.h in gssdp-socket-functions.c
    
    PKTINFO socket option was not set because of missing HAVE_PKTINFO
    definition.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=733651

 libgssdp/gssdp-socket-functions.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libgssdp/gssdp-socket-functions.c b/libgssdp/gssdp-socket-functions.c
index 3ebec10..ecbe5f9 100644
--- a/libgssdp/gssdp-socket-functions.c
+++ b/libgssdp/gssdp-socket-functions.c
@@ -19,6 +19,7 @@
  * Boston, MA 02110-1301, USA.
  */
 
+#include <config.h>
 #include <errno.h>
 #include <string.h>