nsf_init -> gstnsf_init to prevent symbol conflict with security/nss

$OpenBSD: patch-gst_nsf_gstnsf_c,v 1.3 2011/03/07 19:43:35 ajacoutot Exp $
--- gst/nsf/gstnsf.c.orig	Tue Oct 19 19:00:13 2010
+++ gst/nsf/gstnsf.c	Sat Feb 26 19:09:58 2011
@@ -172,7 +172,7 @@ gst_nsfdec_class_init (GstNsfDec * klass)
   GST_DEBUG_CATEGORY_INIT (nsfdec_debug, "nsfdec", 0,
       "NES sound file (nsf) decoder");
 
-  nsf_init ();
+  gstnsf_init ();
 }
 
 static void
