[patch] fix openacc data clause errors in c/c++ for PR70688

[Cesar Philippidis]

This patch makes the c and c++ FEs aware that acc data clauses are not
omp maps. I've also taught those FEs that reduction clauses are not data
clauses in openacc, which fixes PR70688.

I don't really like how *finish_omp_clauses has default arguments for
declare_simd, is_cilk and not is_oacc, but I went with that because it
seems like the thing to do here. Maybe it would be better if all of
those arguments were consolidated into a single bitmask or enum?

Is this OK for trunk and possibly gcc-6.2?

Cesar
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