meson-introspect: do not include host environment in test/benchmark introspection

The host environment could change between the time "meson setup"
produces intro-tests.json, and the time "meson test" is run.
Including it only adds clutter to the introspection data.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

mesonbuild/mintro.py

@@ -299,7 +299,7 @@ def get_test_list(testdata):
             fname = t.fname
         to['cmd'] = fname + t.cmd_args
         if isinstance(t.env, build.EnvironmentVariables):
-            to['env'] = t.env.get_env(os.environ)
+            to['env'] = t.env.get_env({})
         else:
             to['env'] = t.env
         to['name'] = t.name