[Patch, Fortran] Allow assumed-shape arrays with BIND(C) for TS29113

[Tobias Burnus]

This patch was written on top of the big assumed-shape patch.* However, 
it should also work by itself.

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

Tobias

* http://gcc.gnu.org/ml/fortran/2012-07/msg00052.html
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