[libc++] Temporarily disable std::cin tests on Windows -> Linux cross compiler

To get the bot back to green as we figure out how to handle piping data
into a test running behind a SSH executor.

Author: ldionne

libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sh.cpp

@@ -9,6 +9,10 @@
 // TODO: Investigate
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO: Make it possible to run this test when cross-compiling and running via a SSH executor
+//       This is a workaround to silence issues reported in https://github.com/llvm/llvm-project/pull/66842#issuecomment-1728701639
+// XFAIL: buildhost=windows && target={{.+}}-linux-{{.+}}
+
 // <iostream>
 
 // istream cin;

libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp

@@ -9,6 +9,10 @@
 // TODO: Investigate
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO: Make it possible to run this test when cross-compiling and running via a SSH executor
+//       This is a workaround to silence issues reported in https://github.com/llvm/llvm-project/pull/66842#issuecomment-1728701639
+// XFAIL: buildhost=windows && target={{.+}}-linux-{{.+}}
+
 // <iostream>
 
 // wistream wcin;

libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sh.cpp

@@ -9,6 +9,10 @@
 // TODO: Investigate
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO: Make it possible to run this test when cross-compiling and running via a SSH executor
+//       This is a workaround to silence issues reported in https://github.com/llvm/llvm-project/pull/66842#issuecomment-1728701639
+// XFAIL: buildhost=windows && target={{.+}}-linux-{{.+}}
+
 // <iostream>
 
 // wistream wcin;