message: Fix host platform inconsistencies
  Summary:
  Use `$(exe ...)` macros to force a host platform switch to a configuration
  which is consistent with the C++ platform these tools use.
diff: import json
  import os
  +import shlex
  import shutil
  import subprocess
  import tempfile
  @@ -26,8 +27,8 @@ class ArtifactsTestFixture(unittest.TestCase):
  json.dump(self.config, f)
  subprocess.check_call(
  - [
  - os.environ["REDEX_SCRIPT"],
  + shlex.split(os.environ["REDEX_SCRIPT"])
  + + [
  "-P",
  os.environ["PG_CONFIG"],
  "-c",
  