This enables running the check-revng-conventions script as part of the
build and install process, to generate the .clang-format file for
installation and use from other projects.
This option is enabled with --print-clang-format-config.
This is useful to work around the fact that clang-format configuration
is hard-coded in a file.
Using this option is easier to generate a .clang-format file that can be
dropped in single projects to be picked up by IDE.
The format file has also been renamed to revng-clang-format-style-file.
The check-revng-conventions scripts now always uses the same format
file, unless otherwise specified with the new option
--use-local-clang-format-file.
In this way, the check-revng-conventions uses the same format in all the
projects by default, but if a project needs to customize it (e.g.
cold-revng which follows the Qt style) it can use the new flag to
fallback to using the local .clang-format file.
Andrea Gussoni