[PATCH] Introduce warning -Womp-default-scope

[VandeVondele Joost]

Attached patch introduces an optional warning for an OMP parallel/task/teams construct without explicit default(none). This would effectively catch the number one reason of easy-to-avoid OMP bugs in our project.

Tested with check-fortran, full bootstrap & check in progress. OK for trunk if this passes ?

Joost
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