[Patch] OpenMP: Update OMP_REQUIRES_TARGET_USED for declare_target + interop

[Tobias Burnus]

OpenMP mandates that when certain clauses are used with 'omp requires' 
that in all compilation units this requires clause appears.

Those clauses influence the offloading behavior (+ potentially codegen); 
hence, the must requires must match for those claues when device code is 
involved. That's the case for device functions (in particular 'declare 
target') and all OpenMP directives that take a 'device' clause.

Before OpenMP was rather vague, but in .e.g. TR13, it is fortunally more 
explicit. Thus, this patch adds it for 'declare target' and it adds it 
("device" clause!) for 'interop' (but only for Fortran as C/C++ still 
does not support 'interop' directive plarsing.)

And comment before I commit it?

Tobias

PS: In TR13, page 321, lines 14–16 — 
https://www.openmp.org/wp-content/uploads/openmp-TR13.pdf
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