Only run foundation tests for faster builds

Author: bnbarham

utils/build.ps1

@@ -199,10 +199,11 @@ if ($WindowsSDKArchitectures.Length -eq 1) { $WindowsSDKArchitectures = $Windows
 
 if ($Test.Length -eq 1) { $Test = $Test[0].Split(",") }
 
-if ($Test -contains "*") {
-  # Explicitly don't include llbuild yet since tests are known to fail on Windows
-  $Test = @("lld", "lldb", "swift", "dispatch", "foundation", "xctest", "swift-format", "sourcekit-lsp")
-}
+#if ($Test -contains "*") {
+#  # Explicitly don't include llbuild yet since tests are known to fail on Windows
+#  $Test = @("lld", "lldb", "swift", "dispatch", "foundation", "xctest", "swift-format", "sourcekit-lsp")
+#}
+$Test = @("foundation")
 
 ## Declare static build and build tool parameters.