Fortran: Fix failing character pointer fcn assignment [PR105054]

2024-11-14  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/105054
	* resolve.cc (get_temp_from_expr): If the pointer function has
	a deferred character length, generate a new deferred charlen
	for the temporary.

gcc/testsuite/
	PR fortran/105054
	* gfortran.dg/ptr_func_assign_6.f08: New test.