[Patch, Fortran] Mark intrinsics called by the finalization wrapper as attr.artificial

[Tobias Burnus]

Testing showed that the finalization wrapper caused errors of the kind:

Error: The intrinsic '_F.rank' declared INTRINSIC at (1) is not 
available in the current standard settings but new in TS 29113.  Use an 
appropriate -std=* option or enable -fall-intrinsics in order to use it.

That's fixed by the attached patch, which I have committed as obvious 
(Rev. 199355). (I have a test case, which depends on a not yet submitted 
patch. The artificial cannot interfere with user functions as GFC_PREFIX 
gives a symtree which cannot interfere with a normal Fortran name.)

Tobias
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