Fix some test failures for Windows.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@223982 91177308-0d34-0410-b5e6-96231b3b80d8
Disable the remaining ProcessIO test on Windows.

This still relies on PutSTDIN, just indirectly.  So it was hanging
due to not being able to get stdin from the test.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@223983 91177308-0d34-0410-b5e6-96231b3b80d8