* meson.build: Check the return value of `run_command`.

By default, errors are not checked and a command that is somehow broken will
just capture incorrect output (likely an empty string).  Current development
versions of meson now raise a warning for this implicit behavior, and advise
explicitly setting the `check:` keyword argumend to determine whether a
failing return code should be considered an error.

Since none of the commands in this project are expected to fail, mark them
as required to succeed.
1 file changed