[PATCH 1/4] tests: Fix Python test environment setup in meson.build

[Douglas Anderson <dianders@chromium.org>]

Commit ecb21febfdd3 ("meson: port python bindings to build natively via
meson and meson-python") moved the generated `libfdt.py` and `_libfdt`
extension module into `<build_root>/pylibfdt`, leaving
`<source_root>/pylibfdt` with only the source files.

`tests/meson.build` was still setting `PYTHONPATH` to
`meson.project_source_root() / 'pylibfdt'`, which only went unnoticed
because `tests/pylibfdt_tests.py` manually inserts `../pylibfdt` into
`sys.path`. It also checked `if not py.found()` instead of
`if not pylibfdt_enabled` when setting `NO_PYTHON`.

Update `tests/meson.build` to check `pylibfdt_enabled` and set
`PYTHONPATH` to `meson.project_build_root() / 'pylibfdt'` so Python
tools invoked by `run_tests.sh` can import `libfdt` directly.

Assisted-by: Gemini:gemini-pro-prerelease
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 tests/meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/meson.build b/tests/meson.build
index c6ac2d7f8ec4..c25500606059 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -114,12 +114,12 @@ endforeach
 run_tests = find_program('run_tests.sh')
 
 env = []
-if not py.found()
+if not pylibfdt_enabled
   env += 'NO_PYTHON=1'
 else
   env += [
     'PYTHON=' + py.full_path(),
-    'PYTHONPATH=' + meson.project_source_root() / 'pylibfdt',
+    'PYTHONPATH=' + meson.project_build_root() / 'pylibfdt',
     'NO_PYTHON=0',
   ]
 endif
-- 
2.56.0.176.g3575e65682-goog