[patch][Fortran] Actually permit OpenMP's 'target simd'

[Tobias Burnus]

Seemingly, 'target simd' was forgotten – which yielded the error:
"Unexpected !$OMP TARGET SIMD statement"

OK for the trunk?

Tobias

PS: The test case should also work as 'dg-do run' test, if it makes more 
sense. (Only tested on a system w/o offloading, but I would test it with 
nvptx before committing it.)

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