* gdb.t06/break.exp: Remove setup_xfails for

    * gdb.t06/break.exp:  Remove setup_xfails for
        sparc-sun-solaris2.*, these tests now pass with latest gcc and gdb.
        * gdb.t20/inherit.exp (test_ptype_si):  Update warning message
        about known bug in gcc to include up through 2.5.8.
        * gdb.t20/inherit.exp (test_ptype_vi):  Accept "_vb." as well as
        well as "_vb$".
        * gdb.t21/cplusfuncs.exp (test_lookup_operator_functions):
        Remove setup_xfails for sparc-sun-solaris2.*, these tests no pass
        with latest gcc and gdb.
        * gdb.t22/virtfunc.exp (test_ptype_of_classes):  Accept "_vb." as
        well as "_vb$".