Remove coreclr patches from source-build repo
Remove coreclr patches from source-build repo

Updates the branch to include patches that were applied in source-build:

0001-Respect-NUGET_PACKAGES-if-it-is-set.patch
0002-Unify-CLI-and-BuildTools-Versions.patch
0003-Add-clear-to-NuGet.config.patch
0004-PATCH-Use-clang-3.9-by-default.patch

ruben-ayrapetyan/coreclr,yizhang82/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,poizan42/coreclr,cshung/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,krk/coreclr,mmitche/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,JosephTremoulet/coreclr,yizhang82/coreclr,krk/coreclr,krk/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,krk/coreclr,poizan42/coreclr,ruben-ayrapetyan/coreclr,ruben-ayrapetyan/coreclr,mmitche/coreclr,cshung/coreclr,mmitche/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,mmitche/coreclr,JosephTremoulet/coreclr,JosephTremoulet/coreclr,JosephTremoulet/coreclr,cshung/coreclr,mmitche/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr,wtgodbe/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,yizhang82/coreclr,yizhang82/coreclr,krk/coreclr,JosephTremoulet/coreclr,krk/coreclr