More configuration changes for running the test suite against MSVC's STL

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292337 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/experimental/string.view/lit.local.cfg

@@ -0,0 +1,3 @@
+# Disable all of the filesystem tests if the correct feature is not available.
+if 'msvc' in config.available_features:
+  config.unsupported = True

test/std/input.output/iostreams.base/ios.base/ios.base.storage/iword.pass.cpp

@@ -13,6 +13,9 @@
 
 // long& iword(int idx);
 
+// This test compiles but never completes when compiled against the MSVC STL
+// UNSUPPORTED: msvc
+
 #include <ios>
 #include <string>
 #include <cassert>

test/std/input.output/iostreams.base/ios.base/ios.base.storage/pword.pass.cpp

@@ -13,6 +13,9 @@
 
 // void*& pword(int idx);
 
+// This test compiles but never completes when compiled against the MSVC STL
+// UNSUPPORTED: msvc
+
 #include <ios>
 #include <string>
 #include <cassert>