gst_init: Don't intercept --help

Before this patch gst_init would intercept --help, causing for example
cheese's --help to look like this:

[hans@shalem cheese]$ cheese --help
Usage:
  cheese [OPTION...] - GStreamer initialization

Help Options:
  -h, --help                        Show help options
  --help-all                        Show all help options
  --help-gst                        Show GStreamer Options

gst_init is the only gfoo_init function which does this, this patch fixes this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff -up gstreamer-1.0.7/gst/gst.c~ gstreamer-1.0.7/gst/gst.c
--- gstreamer-1.0.7/gst/gst.c~	2013-04-26 09:25:31.000000000 +0200
+++ gstreamer-1.0.7/gst/gst.c	2013-06-12 14:59:46.111904434 +0200
@@ -403,6 +403,7 @@ gst_init_check (int *argc, char **argv[]
 #ifndef GST_DISABLE_OPTION_PARSING
   ctx = g_option_context_new ("- GStreamer initialization");
   g_option_context_set_ignore_unknown_options (ctx, TRUE);
+  g_option_context_set_help_enabled (ctx, FALSE);
   group = gst_init_get_option_group ();
   g_option_context_add_group (ctx, group);
   res = g_option_context_parse (ctx, argc, argv, err);
