[Patch, Fortran] PR 48174+45304: No varags if interface is known

[Tobias Burnus]

This patch makes sure that there is no vararg if the procedure interface 
is known. Before, for functions and subroutines without arguments, no 
void_list_node.

(Related, separate and unfixed issue: For procedures without explicit 
interface, the interface should be deduced from the usage.)

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

Tobias
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