build: explicitly set check arg in run_command()

Fixes the following warning:

    WARNING: You should add the boolean check kwarg to the run_command call.
             It currently defaults to false,
             but it will default to true in future releases of meson.
             See also: https://github.com/mesonbuild/meson/issues/9300



Signed-off-by: Simon Ser <contact@emersion.fr>