gst: Don't intercept --help in gst_init()
gst: Don't intercept --help in gst_init()

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.

https://bugzilla.gnome.org/show_bug.cgi?id=702089

cablelabs/gstreamer,cfoch/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,justinjoy/gstreamer,centricular/gstreamer,collects/gstreamer,justinjoy/gstreamer,Lachann/gstreamer,collects/gstreamer,ensonic/gstreamer,lubosz/gstreamer,Lachann/gstreamer,centricular/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,mparis/gstreamer,surround-io/gstreamer,lubosz/gstreamer,ensonic/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,mparis/gstreamer,jpakkane/gstreamer,collects/gstreamer,krichter722/gstreamer,centricular/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,collects/gstreamer,Lachann/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,mparis/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,centricular/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,lubosz/gstreamer,krichter722/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,centricular/gstreamer,collects/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,lovebug356/gstreamer,surround-io/gstreamer,Lachann/gstreamer,mparis/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,mparis/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,jpxiong/gstreamer