[Patch, Fortran] PR 52542 - Fix PROCEDURE() with Bind(C)

[Tobias Burnus]

If the interface in a PROCEDURE() statement is Bind(C), also the 
procedure (pointer) declared in that statement is BIND(C).

 From the F2008 standard: "A proc-language-binding-spec without a NAME= 
is allowed, but is redundant with the proc-interface required by C1222."

Build and currently regtested on x86-64-linux.
OK for the trunk (if regtesting succeeded)?

Tobias
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