Fortran: This patch fixes comments 23 and 24 of PR96320.

Fortran: This patch fixes comments 23 and 24 of PR96320.

2021-01-21  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/96320
	* decl.c (gfc_match_modproc): It is not an error to find a
	module procedure declaration within a contains block.
	* expr.c (gfc_check_vardef_context): Pure procedure result is
	assignable. Change 'own_scope' accordingly.
	* resolve.c (resolve_typebound_procedure): A procedure that
	has the module procedure attribute is almost certainly a
	module procedure, whatever its interface.

gcc/testsuite/
	PR fortran/96320
	* gfortran.dg/module_procedure_5.f90 : New test.
	* gfortran.dg/module_procedure_6.f90 : New test.