contrib/fedora: update configure-for-system to use meson by default
Summary
Makes it so that meson is used if there is no indication that the user prefers autotools (no ./configure file is present).
Purpose
We are dropping autotools soon, and so for now we are updating the defaults to use meson.
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
-
the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.