Add mkdir for CoreFx directory
Add mkdir for CoreFx directory

In PR 8997 I accidentally removed the mkdir that creates the corefx
directory for us to copy the test zip into.  I did this when I was
adding Https to the URLs that we use to download the information from
Jenkins.  This adds back that bit.

yeaicc/coreclr,cmckinsey/coreclr,sagood/coreclr,cshung/coreclr,russellhadley/coreclr,rartemev/coreclr,hseok-oh/coreclr,tijoytom/coreclr,yeaicc/coreclr,pgavlin/coreclr,yeaicc/coreclr,kyulee1/coreclr,dpodder/coreclr,JosephTremoulet/coreclr,parjong/coreclr,alexperovich/coreclr,cshung/coreclr,cmckinsey/coreclr,alexperovich/coreclr,wateret/coreclr,krk/coreclr,yizhang82/coreclr,mmitche/coreclr,cydhaselton/coreclr,JosephTremoulet/coreclr,russellhadley/coreclr,sagood/coreclr,pgavlin/coreclr,JonHanna/coreclr,krytarowski/coreclr,AlexGhiondea/coreclr,alexperovich/coreclr,sjsinju/coreclr,cydhaselton/coreclr,wateret/coreclr,hseok-oh/coreclr,JonHanna/coreclr,neurospeech/coreclr,wateret/coreclr,gkhanna79/coreclr,sjsinju/coreclr,cmckinsey/coreclr,sagood/coreclr,cmckinsey/coreclr,cmckinsey/coreclr,cshung/coreclr,sjsinju/coreclr,wtgodbe/coreclr,yeaicc/coreclr,ragmani/coreclr,sagood/coreclr,dpodder/coreclr,wtgodbe/coreclr,kyulee1/coreclr,mskvortsov/coreclr,wateret/coreclr,russellhadley/coreclr,cydhaselton/coreclr,rartemev/coreclr,mskvortsov/coreclr,neurospeech/coreclr,James-Ko/coreclr,James-Ko/coreclr,neurospeech/coreclr,kyulee1/coreclr,yizhang82/coreclr,poizan42/coreclr,JosephTremoulet/coreclr,yeaicc/coreclr,alexperovich/coreclr,mskvortsov/coreclr,dpodder/coreclr,AlexGhiondea/coreclr,tijoytom/coreclr,cshung/coreclr,ragmani/coreclr,wtgodbe/coreclr,wateret/coreclr,neurospeech/coreclr,wtgodbe/coreclr,kyulee1/coreclr,kyulee1/coreclr,James-Ko/coreclr,cmckinsey/coreclr,jamesqo/coreclr,JonHanna/coreclr,neurospeech/coreclr,ruben-ayrapetyan/coreclr,ragmani/coreclr,parjong/coreclr,gkhanna79/coreclr,JosephTremoulet/coreclr,qiudesong/coreclr,AlexGhiondea/coreclr,krytarowski/coreclr,ruben-ayrapetyan/coreclr,cshung/coreclr,rartemev/coreclr,qiudesong/coreclr,YongseopKim/coreclr,gkhanna79/coreclr,wtgodbe/coreclr,AlexGhiondea/coreclr,yeaicc/coreclr,cydhaselton/coreclr,pgavlin/coreclr,hseok-oh/coreclr,qiudesong/coreclr,YongseopKim/coreclr,rartemev/coreclr,yizhang82/coreclr,yizhang82/coreclr,sjsinju/coreclr,krytarowski/coreclr,gkhanna79/coreclr,ragmani/coreclr,JonHanna/coreclr,wtgodbe/coreclr,sjsinju/coreclr,mmitche/coreclr,pgavlin/coreclr,dpodder/coreclr,rartemev/coreclr,James-Ko/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,sjsinju/coreclr,botaberg/coreclr,jamesqo/coreclr,YongseopKim/coreclr,poizan42/coreclr,mskvortsov/coreclr,poizan42/coreclr,tijoytom/coreclr,russellhadley/coreclr,russellhadley/coreclr,krytarowski/coreclr,jamesqo/coreclr,botaberg/coreclr,krk/coreclr,AlexGhiondea/coreclr,alexperovich/coreclr,kyulee1/coreclr,wateret/coreclr,tijoytom/coreclr,dpodder/coreclr,mmitche/coreclr,botaberg/coreclr,tijoytom/coreclr,cshung/coreclr,James-Ko/coreclr,ruben-ayrapetyan/coreclr,krk/coreclr,cmckinsey/coreclr,parjong/coreclr,pgavlin/coreclr,YongseopKim/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,JonHanna/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,mskvortsov/coreclr,krytarowski/coreclr,AlexGhiondea/coreclr,yeaicc/coreclr,tijoytom/coreclr,botaberg/coreclr,hseok-oh/coreclr,sagood/coreclr,mmitche/coreclr,dpodder/coreclr,YongseopKim/coreclr,James-Ko/coreclr,botaberg/coreclr,mmitche/coreclr,qiudesong/coreclr,rartemev/coreclr,pgavlin/coreclr,yizhang82/coreclr,jamesqo/coreclr,cydhaselton/coreclr,ragmani/coreclr,botaberg/coreclr,parjong/coreclr,hseok-oh/coreclr,poizan42/coreclr,qiudesong/coreclr,alexperovich/coreclr,ragmani/coreclr,gkhanna79/coreclr,yizhang82/coreclr,sagood/coreclr,parjong/coreclr,qiudesong/coreclr,neurospeech/coreclr,YongseopKim/coreclr,parjong/coreclr,cydhaselton/coreclr,krk/coreclr,krk/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,JosephTremoulet/coreclr,mskvortsov/coreclr,gkhanna79/coreclr,russellhadley/coreclr,krytarowski/coreclr,JonHanna/coreclr,krk/coreclr,mmitche/coreclr