MS-Windows tests failures

[ikappaki]

The test suite fails on MS-Windows for several tests

To reproduce, on MS-Windows with Python-3.8 run

> pytest
================================================= test session starts =================================================
platform win32 -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: c:\src\basilisp, configfile: pyproject.toml
plugins: basilisp-0.1.0a1, pycharm-0.7.0
collected 3013 items
# ....
=============================================== short test summary info ===============================================
FAILED tests/basilisp/compiler_test.py::TestSymbolResolution::test_aliased_namespace_not_hidden_by_python_module -
FAILED tests/basilisp/test_core_macros.lpy::with-test
FAILED tests/basilisp/test_io.lpy::reader-test
FAILED tests/basilisp/test_io.lpy::writer-test
FAILED tests/basilisp/test_io.lpy::input-stream-test
FAILED tests/basilisp/test_io.lpy::output-stream-test
FAILED tests/basilisp/testrunner_test.py::TestTestrunner::test_error_repr -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_without_cache -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_cache -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_invalid_cache_magic_number -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_truncated_timestamp -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_invalid_timestamp -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_truncated_rawsize -
ERROR tests/basilisp/importer_test.py::TestImporter::test_import_module_with_invalid_rawsize -
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_module_no_child -
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_module_with_non_code_child -
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_module_without_init_with_python_child
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_basilisp_child_with_python_init
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_basilisp_and_python_module_siblings
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_basilisp_child_with_basilisp_init
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_module_without_init -
ERROR tests/basilisp/importer_test.py::TestImporter::TestPackageStructure::test_import_module_with_namespace_only_pkg
================================ 7 failed, 3006 passed, 16 errors in 189.23s (0:03:09) ================================

PR with fixes to follow.