[Patch, Fortran] attribute declaration outside of INTERFACE body (PR36361)

[Janus Weil]

> here is my patch for PR36361, including test cases, regtested on
> i686-pc-linux-gnu with no
> failures. It also includes the one-line fix from PR36275 comment #3.

I have modified the fix for PR36275 a little, so that it also fixes
PR36322, which is actually related. Both are based on a sub-optimal
mechanism for copying the typespec for a PROCEDURE from its interface
(which happens in "resolve_symbol"). Before, the elements of ts were
just copied one by one (missing a few, which caused the problems). Now
I made sure that all of them are copied, an that the way of doing this
still works even if new elements are added in the future.

I also added a test case for PR36322.

> There is just one thing I need someone's opinion on: The new test case
> interface_24.f90 has some slight issues regarding error recovery.

I'd still like to hear some thoughts on this.

Cheers,
Janus
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