Fix a function decl in gfortran

[Tobias Burnus]

Hi Bernd,

Bernd Schmidt wrote:
> On 06/04/2014 09:40 AM, Tobias Burnus wrote:
>> I intent to tests the build and test the patch - and then to
>> commit it as obvious. If you see problems with this approach
>> please scream now.
>
> Even with this applied, I'm still seeing similar failures.

I didn't claim that the patch would fix everything – nor that it was 
well tested.

Can you try the attached version? The change is that I now properly use 
"se->ignore_optional" to test whether absent optional arguments should 
be skipped - rather than using this mornings ad-hoc solution of doing so 
unconditionally. Additionally, the patch has now survived stage2 
building – which is more testing than I could do this morning.

Tobias
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