PR 6926

    PR 6926
        * read.c (get_line_sb): Renamed to get_non_macro_line_sb.
        (_find_end_of_line): Add extra parameter indicating if the line is
        inside a macro.  If it is then do not allow the @ character to be
        treated as a line separator character.
        (read_a_source): Update use of _find_end_of_line.
        (find_end_of_line): Likewise.
        (s_irp): Update use of get_line_sb.
        (s_macro): Likewise.
        (do_repeat): Likewise.
        (get_line_sb): New function.  Like the old version of get_line_sb
        except that it takes an extra parameter indicating whether the
        line is inside a macro.
        (get_macro_line_sb): New function.