This allows us to override and clear the reset isolation bit.
It will be used in the following patch to override missing support
for GLX_CONTEXT_RESET_ISOLATION_BIT_ARB.
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38668>