Fortran: Avoid var initialization in interfaces [PR54753]

Fortran: Avoid var initialization in interfaces [PR54753]

Intent(out) implies deallocation/default initialization; however, it is
pointless to do this for dummy-arguments symbols of procedures which are
inside an INTERFACE block. – This also fixes a bogus error for the attached
included testcase, but fixing the non-interface version still has to be done.

	PR fortran/54753

gcc/fortran/ChangeLog:

	* resolve.c (can_generate_init, resolve_fl_variable_derived,
	resolve_symbol): Only do initialization with intent(out) if not
	inside of an interface block.

(cherry picked from commit 51d9ef7747b2dc439f7456303f0784faf5cdb1d3)