driconf: add allow_higher_compat_version option

driconf: add allow_higher_compat_version option

Mesa currently doesn't allow to create 3.1+ compatibility profiles
mainly because various features are unimplemented and bugs can
happen.

However, some buggy apps request a compat profile without using
any old features unimplemented in mesa, and they fail to start.

This option should help some games to run but it's not enough
for all (eg. Dying Light).

v2: - s/force_compat_profile/allow_higher_compat_version

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Edmondo Tommasina <edmondo.tommasina@gmail.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>