[Patch, Fortran, committed] PR56138 - fix deferred-length character result

[Tobias Burnus]

This patch undoes the patch 
http://gcc.gnu.org/ml/fortran/2013-01/msg00219.html which doesn't fix 
the original problem. (The ICE only occurs if the function is not an 
internal or module procedure!)

As Paul's variant (cf. PR) fixes the issue, this patch now undoes my 
patch and uses his. Additionally, it adds a modified test case (by 
Dominique) which uses a bare, non-contained function.

Build and regtested on x86-64-gnu-linux.

Tobias
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