Fix HttpClient package for NETCore50
Fix HttpClient package for NETCore50

Recent refactoring broke asset selection for HttpClient on NETCore50.

I had removed PackageTargetRuntime in order to use PackageDestination
instead but this caused the RID-specific implementation to be chosen for
NETCore50:
https://github.com/ericstj/corefx/commit/0a8c4fb115246f80bcc86ddb88797bfd1c7271f7#diff-d6c266b4814b075db300e51936fdf722L17

Instead we need to make sure that we package the NETCore50 build
as RID-specific as well so that it can take precedence of the RID-
specific NETStandard implementation.

mazong1123/corefx,YoupHulsebos/corefx,marksmeltzer/corefx,billwert/corefx,billwert/corefx,shimingsg/corefx,jlin177/corefx,Petermarcu/corefx,nchikanov/corefx,tijoytom/corefx,JosephTremoulet/corefx,weltkante/corefx,gkhanna79/corefx,ViktorHofer/corefx,nchikanov/corefx,tstringer/corefx,ellismg/corefx,dhoehna/corefx,rahku/corefx,DnlHarvey/corefx,YoupHulsebos/corefx,adamralph/corefx,cydhaselton/corefx,krytarowski/corefx,twsouthwick/corefx,Chrisboh/corefx,tstringer/corefx,shimingsg/corefx,adamralph/corefx,richlander/corefx,Jiayili1/corefx,nbarbettini/corefx,twsouthwick/corefx,mmitche/corefx,fgreinacher/corefx,Jiayili1/corefx,Chrisboh/corefx,axelheer/corefx,parjong/corefx,dsplaisted/corefx,richlander/corefx,YoupHulsebos/corefx,iamjasonp/corefx,lggomez/corefx,nchikanov/corefx,Ermiar/corefx,cydhaselton/corefx,MaggieTsang/corefx,ptoonen/corefx,jhendrixMSFT/corefx,stephenmichaelf/corefx,tijoytom/corefx,ellismg/corefx,mazong1123/corefx,zhenlan/corefx,alexperovich/corefx,cydhaselton/corefx,ravimeda/corefx,YoupHulsebos/corefx,elijah6/corefx,rahku/corefx,stephenmichaelf/corefx,krytarowski/corefx,MaggieTsang/corefx,Chrisboh/corefx,JosephTremoulet/corefx,Petermarcu/corefx,billwert/corefx,rjxby/corefx,zhenlan/corefx,nbarbettini/corefx,manu-silicon/corefx,tstringer/corefx,billwert/corefx,ravimeda/corefx,ravimeda/corefx,Priya91/corefx-1,YoupHulsebos/corefx,richlander/corefx,zhenlan/corefx,krk/corefx,Chrisboh/corefx,manu-silicon/corefx,jlin177/corefx,Priya91/corefx-1,shmao/corefx,dhoehna/corefx,ptoonen/corefx,cartermp/corefx,iamjasonp/corefx,wtgodbe/corefx,jhendrixMSFT/corefx,Chrisboh/corefx,stone-li/corefx,dotnet-bot/corefx,Petermarcu/corefx,SGuyGe/corefx,tijoytom/corefx,jlin177/corefx,yizhang82/corefx,Petermarcu/corefx,the-dwyer/corefx,the-dwyer/corefx,richlander/corefx,tijoytom/corefx,wtgodbe/corefx,shimingsg/corefx,zhenlan/corefx,shimingsg/corefx,rahku/corefx,dotnet-bot/corefx,stephenmichaelf/corefx,yizhang82/corefx,SGuyGe/corefx,axelheer/corefx,alphonsekurian/corefx,ravimeda/corefx,jlin177/corefx,twsouthwick/corefx,ptoonen/corefx,krytarowski/corefx,rubo/corefx,lggomez/corefx,nchikanov/corefx,seanshpark/corefx,ellismg/corefx,alphonsekurian/corefx,JosephTremoulet/corefx,dhoehna/corefx,marksmeltzer/corefx,iamjasonp/corefx,khdang/corefx,billwert/corefx,richlander/corefx,seanshpark/corefx,jlin177/corefx,yizhang82/corefx,Jiayili1/corefx,weltkante/corefx,fgreinacher/corefx,elijah6/corefx,rjxby/corefx,mazong1123/corefx,zhenlan/corefx,alexperovich/corefx,twsouthwick/corefx,Chrisboh/corefx,shmao/corefx,gkhanna79/corefx,twsouthwick/corefx,tijoytom/corefx,wtgodbe/corefx,krytarowski/corefx,lggomez/corefx,jhendrixMSFT/corefx,cartermp/corefx,stone-li/corefx,ellismg/corefx,krk/corefx,ViktorHofer/corefx,dotnet-bot/corefx,MaggieTsang/corefx,ericstj/corefx,lggomez/corefx,tijoytom/corefx,cydhaselton/corefx,mazong1123/corefx,DnlHarvey/corefx,DnlHarvey/corefx,cydhaselton/corefx,rubo/corefx,ViktorHofer/corefx,cartermp/corefx,shmao/corefx,marksmeltzer/corefx,JosephTremoulet/corefx,Petermarcu/corefx,stephenmichaelf/corefx,cartermp/corefx,axelheer/corefx,ericstj/corefx,iamjasonp/corefx,nchikanov/corefx,manu-silicon/corefx,nbarbettini/corefx,stone-li/corefx,Petermarcu/corefx,BrennanConroy/corefx,ravimeda/corefx,rahku/corefx,billwert/corefx,lggomez/corefx,stone-li/corefx,alexperovich/corefx,dsplaisted/corefx,SGuyGe/corefx,alphonsekurian/corefx,rjxby/corefx,cydhaselton/corefx,seanshpark/corefx,elijah6/corefx,jlin177/corefx,seanshpark/corefx,alexperovich/corefx,rahku/corefx,ericstj/corefx,alexperovich/corefx,alexperovich/corefx,nbarbettini/corefx,shimingsg/corefx,mazong1123/corefx,ravimeda/corefx,mmitche/corefx,krk/corefx,twsouthwick/corefx,gkhanna79/corefx,fgreinacher/corefx,yizhang82/corefx,ViktorHofer/corefx,jhendrixMSFT/corefx,gkhanna79/corefx,fgreinacher/corefx,ellismg/corefx,jhendrixMSFT/corefx,khdang/corefx,mmitche/corefx,richlander/corefx,krk/corefx,DnlHarvey/corefx,YoupHulsebos/corefx,Jiayili1/corefx,marksmeltzer/corefx,ericstj/corefx,nbarbettini/corefx,Ermiar/corefx,wtgodbe/corefx,mazong1123/corefx,manu-silicon/corefx,khdang/corefx,Ermiar/corefx,adamralph/corefx,axelheer/corefx,seanshpark/corefx,manu-silicon/corefx,stone-li/corefx,twsouthwick/corefx,Jiayili1/corefx,parjong/corefx,stephenmichaelf/corefx,Ermiar/corefx,stephenmichaelf/corefx,Ermiar/corefx,dhoehna/corefx,jlin177/corefx,shimingsg/corefx,manu-silicon/corefx,elijah6/corefx,the-dwyer/corefx,rahku/corefx,rahku/corefx,mazong1123/corefx,richlander/corefx,Ermiar/corefx,khdang/corefx,alphonsekurian/corefx,rubo/corefx,elijah6/corefx,MaggieTsang/corefx,ViktorHofer/corefx,krk/corefx,BrennanConroy/corefx,shimingsg/corefx,seanshpark/corefx,iamjasonp/corefx,lggomez/corefx,BrennanConroy/corefx,parjong/corefx,alexperovich/corefx,zhenlan/corefx,manu-silicon/corefx,the-dwyer/corefx,yizhang82/corefx,ericstj/corefx,ViktorHofer/corefx,alphonsekurian/corefx,axelheer/corefx,rjxby/corefx,rubo/corefx,elijah6/corefx,SGuyGe/corefx,rjxby/corefx,khdang/corefx,nchikanov/corefx,SGuyGe/corefx,seanshpark/corefx,shmao/corefx,shmao/corefx,the-dwyer/corefx,the-dwyer/corefx,Ermiar/corefx,marksmeltzer/corefx,mmitche/corefx,tijoytom/corefx,parjong/corefx,weltkante/corefx,jhendrixMSFT/corefx,dsplaisted/corefx,dhoehna/corefx,Priya91/corefx-1,nbarbettini/corefx,ellismg/corefx,marksmeltzer/corefx,iamjasonp/corefx,mmitche/corefx,parjong/corefx,rjxby/corefx,wtgodbe/corefx,alphonsekurian/corefx,DnlHarvey/corefx,krytarowski/corefx,marksmeltzer/corefx,shmao/corefx,khdang/corefx,DnlHarvey/corefx,stephenmichaelf/corefx,tstringer/corefx,wtgodbe/corefx,axelheer/corefx,weltkante/corefx,Jiayili1/corefx,MaggieTsang/corefx,billwert/corefx,dotnet-bot/corefx,parjong/corefx,JosephTremoulet/corefx,iamjasonp/corefx,Priya91/corefx-1,rjxby/corefx,alphonsekurian/corefx,mmitche/corefx,Jiayili1/corefx,dhoehna/corefx,tstringer/corefx,ViktorHofer/corefx,ptoonen/corefx,cartermp/corefx,parjong/corefx,zhenlan/corefx,krk/corefx,yizhang82/corefx,gkhanna79/corefx,JosephTremoulet/corefx,ptoonen/corefx,nbarbettini/corefx,dotnet-bot/corefx,ericstj/corefx,dotnet-bot/corefx,nchikanov/corefx,krytarowski/corefx,DnlHarvey/corefx,stone-li/corefx,yizhang82/corefx,elijah6/corefx,weltkante/corefx,JosephTremoulet/corefx,krk/corefx,SGuyGe/corefx,stone-li/corefx,tstringer/corefx,weltkante/corefx,cartermp/corefx,weltkante/corefx,ptoonen/corefx,rubo/corefx,lggomez/corefx,ptoonen/corefx,gkhanna79/corefx,gkhanna79/corefx,ravimeda/corefx,wtgodbe/corefx,MaggieTsang/corefx,ericstj/corefx,the-dwyer/corefx,dotnet-bot/corefx,Priya91/corefx-1,YoupHulsebos/corefx,jhendrixMSFT/corefx,shmao/corefx,Petermarcu/corefx,mmitche/corefx,Priya91/corefx-1,krytarowski/corefx,dhoehna/corefx,cydhaselton/corefx,MaggieTsang/corefx