[master] Update dependencies from dotnet/arcade dotnet/core-setup dotnet/corefx (#17458)

* Update dependencies from https://github.com/dotnet/arcade build 20191018.2

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19518.2
- Microsoft.DotNet.Helix.Sdk - 5.0.0-beta.19518.2

* Update dependencies from https://github.com/dotnet/core-setup build 20191021.2

- Microsoft.NETCore.App - 5.0.0-alpha1.19521.2

* Update dependencies from https://github.com/dotnet/corefx build 20191020.7

- Microsoft.Private.CoreFx.NETCoreApp - 5.0.0-alpha1.19520.7

* Update dependencies from https://github.com/dotnet/arcade build 20191023.3

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19523.3
- Microsoft.DotNet.Helix.Sdk - 5.0.0-beta.19523.3

* Update dependencies from https://github.com/dotnet/core-setup build 20191023.10

- Microsoft.NETCore.App - 5.0.0-alpha1.19523.10

* Update dependencies from https://github.com/dotnet/corefx build 20191023.8

- Microsoft.Private.CoreFx.NETCoreApp - 5.0.0-alpha1.19523.8

* Disable a file system watcher test on mac

See https://github.com/mono/mono/issues/17547

* Reenable tests that were fixed

1 files changed, 14 insertions, 1 deletions

diff --git a/eng/common/build.sh b/eng/common/build.sh
index cc6a2fadbb5..36f9aa0462e 100755
--- a/eng/common/build.sh
+++ b/eng/common/build.sh
@@ -26,6 +26,7 @@ usage()
   echo "  --pack                     Package build outputs into NuGet packages and Willow components"
   echo "  --sign                     Sign build outputs"
   echo "  --publish                  Publish artifacts (e.g. symbols)"
+  echo "  --clean                    Clean the solution"
   echo ""
 
   echo "Advanced settings:"
@@ -62,6 +63,7 @@ publish=false
 sign=false
 public=false
 ci=false
+clean=false
 
 warn_as_error=true
 node_reuse=true
@@ -82,6 +84,9 @@ while [[ $# > 0 ]]; do
       usage
       exit 0
       ;;
+    -clean)
+      clean=true
+      ;;
     -configuration|-c)
       configuration=$2
       shift
@@ -196,7 +201,15 @@ function Build {
   ExitWithExitCode 0
 }
 
-if [[ "$restore" == true && -z ${DisableNativeToolsetInstalls:-} ]]; then
+if [[ "$clean" == true ]]; then
+  if [ -d "$artifacts_dir" ]; then
+    rm -rf $artifacts_dir
+    echo "Artifacts directory deleted."
+  fi
+  exit 0
+fi
+
+if [[ "$restore" == true ]]; then
   InitializeNativeTools
 fi