[Patch, Fortran] Add missing coarray check

[Tobias Burnus]

While checking whether gfortran already handles the new constraint at 
http://j3-fortran.org/doc/year/14/14-140r2.txt (it does), I found the 
following issues:

a) Coarray variables with pointer attribute weren't rejected.
b) There was a copy'n'paste error in symbol.c, having cray_pointer at 
places where one should have cray_pointee, such that the cray-pointer 
test had been done twice.

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

* * *

Admittedly, I cannot find the constraint for (a), but I am certain that 
it is not intended to permit the POINTER attribute. Even using C526 plus 
C528 still seem to permit "integer, save, pointer :: caf[*]". I have now 
asked at the J3 mailing list for a pointer to the right constraint. At 
least Cray's compiler (correctly?!?) rejects coarrays with pointer 
attribute.

Tobias
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