Skip compile-fail tests on Windows for now

These tests need a lot of changes to work on Windows,
so leave them for now. For example, the expected
compiler error message is different (MSVC reports a
C2338 error), include paths often contain spaces which
we don't currently handle, and the command line needs
extra arguments such as /MD to build correctly with Boost.

modules/test/pyext/src/__init__.py

@@ -339,6 +339,8 @@ def _read_cmake_cache(self, cmake_cache):
     def assertCompileFails(self, headers, body):
         """Test that the given C++ code fails to compile with a static
            assertion."""
+        if sys.platform == 'win32':
+            self.skipTest("No support for Windows yet")
         libdir = os.path.dirname(IMP.__file__)
         cmake_cache = os.path.join(libdir, '..', '..', 'CMakeCache.txt')
         if not os.path.exists(cmake_cache):