[fortran,patch] Remove unused gfc_open_intrinsic_module()

[FX]

>> A quick grep through the front-end indicates that
>> gfc_open_intrinsic_module() is never used. Should it have been
>> removed when module file reading/writing was overhauled?
> 
> I suspect the answer is "yes”.

Here’s a patch that removes it. It buils fine.
OK to commit?

FX

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