[Patch, Fortran] Fixes for scalar coarrays

[Tobias Burnus]

The interface.c patch is to avoid a strange error ("actual argument must 
be simply contiguous") which is a bit odd if the actual argument is a 
scalar. As the dummy was an array, a rank mismatch would have been the 
proper error. - The patch simply suppresses the error message such that 
the later error check becomes active.

The rest of the patch: For scalar coarray dummy arguments, the cobounds 
were not properly saved - thus calling the one of the coindex intrinsics 
gave an ICE.

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

Tobias
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