PR fortran/98411 - Pointless warning for static variables

Variables with explicit SAVE attribute cannot end up on the stack.
There is no point in checking whether they should be moved off the
stack to static storage.

gcc/fortran/ChangeLog:

	PR fortran/98411
	* trans-decl.c (gfc_finish_var_decl): Add check for explicit SAVE
	attribute.

gcc/testsuite/ChangeLog:

	PR fortran/98411
	* gfortran.dg/pr98411.f90: New test.