Add an integration test and debug issues with the meson backend (#2718)

* Add an integration test with the meson backend

* Modify script to allow testing of the GHA action on a PR

* Try adding cython to languages in meson config

* Revert "Try adding cython to languages in meson config"

This reverts commit 50378a1c7e38665492ad0c683b178e4d96928e1e.

* Pass --vsenv to meson on windows

As seen here https://github.com/matplotlib/matplotlib/blob/9957c394bd01deb7a9bd9cb27804f447a52dc522/.github/workflows/cibuildwheel.yml#L114

* Disable win32 builds for the meson test

* Move the windows-specific config into the test project definition

This is so it can be tested with bin/run_example_ci_configs.py

* Add some docs to the FAQ about meson on windows

* Update bin/run_example_ci_configs.py

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

---------

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

test/test_meson_python.py

@@ -0,0 +1,29 @@
+import packaging.utils
+
+from . import test_projects, utils
+
+meson_project = test_projects.new_meson_project()
+
+
+def test_meson_python_basic(tmp_path, build_frontend_env):
+    """Test that cibuildwheel can build a project with meson-python backend."""
+    project_dir = tmp_path / "project"
+
+    meson_project.generate(project_dir)
+
+    # build the wheels
+    actual_wheels = utils.cibuildwheel_run(
+        project_dir,
+        add_env=build_frontend_env,
+        single_python=True,
+    )
+
+    # check that the expected wheels are produced
+    # note that the meson test project doesn't support win32.
+    is_windows = utils.get_platform() == "windows"
+    expected_wheels = utils.expected_wheels(
+        "spam", "0.1.0", single_python=True, single_arch=is_windows
+    )
+    actual_wheels_normalized = {packaging.utils.parse_wheel_filename(w) for w in actual_wheels}
+    expected_wheels_normalized = {packaging.utils.parse_wheel_filename(w) for w in expected_wheels}
+    assert actual_wheels_normalized == expected_wheels_normalized