libs/base/typefindhelper: Remove useless typechecking in tight loop
libs/base/typefindhelper: Remove useless typechecking in tight loop

The list against which we run the comparefunc will only contain
GstPluginFeature, therefore remove the 6 expensive type checks we do
for every single comparision.

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