[patch, Fortran] Fix 15/16 regression when non-interoperable types were dumped

[Thomas Koenig]

Hello world,

the attached patch fixes a 15/16 regression and should be fairly
self-explanatory.

Regarding testing: I'm not sure I am up to the task of hacking
dejagnu to do this. I am now running local tests, which is
better than nothing (I guess).

Regression-testing: Passed, though this does not mean a lot.
I have attached the test script which passed.

Fix dumping non-interoperable types with -fc-prototypes.

gcc/fortran/ChangeLog:

	PR fortran/120107
	* dump-parse-tree.cc (write_type): Do not dump non-interoperable
	types.
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