utils: Avoid using "type" as name for a variable and a macro argument in GST_BOILERPLATE
utils: Avoid using "type" as name for a variable and a macro argument in GST_BOILERPLATE

This caused "re-declaration" problems.
./clutter-gst-video-sink.c: In function ‘clutter_gst_video_sink_init_interfaces’:
./clutter-gst-video-sink.c:231:1: warning: declaration of ‘ClutterGstVideoSink’ shadows a global declaration [-Wshadow]
./clutter-gst-video-sink.h:64:44: warning: shadowed declaration is here [-Wshadow]

https://bugzilla.gnome.org/show_bug.cgi?id=646531

jpxiong/gstreamer,Lachann/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,surround-io/gstreamer,krichter722/gstreamer,centricular/gstreamer,magcius/gstreamer,drothlis/gstreamer,magcius/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,ensonic/gstreamer,ahmedammar/platform_external_gst_gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,ylatuya/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,collects/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,drothlis/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,lovebug356/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,cfoch/gstreamer,cfoch/gstreamer,drothlis/gstreamer,cablelabs/gstreamer,ylatuya/gstreamer,justinjoy/gstreamer,shelsonjava/gstreamer,magcius/gstreamer,Distrotech/gstreamer,ensonic/gstreamer,mparis/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,centricular/gstreamer,ylatuya/gstreamer,centricular/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,Distrotech/gstreamer,ahmedammar/platform_external_gst_gstreamer,krieger-od/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,ahmedammar/platform_external_gst_gstreamer,Distrotech/gstreamer,cablelabs/gstreamer,ylatuya/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,collects/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,collects/gstreamer,drothlis/gstreamer,lubosz/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,lubosz/gstreamer,collects/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,Distrotech/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,jpakkane/gstreamer,mparis/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,cfoch/gstreamer,lubosz/gstreamer,collects/gstreamer,cfoch/gstreamer,magcius/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer,magcius/gstreamer,mparis/gstreamer,krichter722/gstreamer,centricular/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,drothlis/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpakkane/gstreamer,krieger-od/gstreamer,Lachann/gstreamer