* tradcif.y: Move lexptr to top of file.  Add rule to handle
        assertions in conditional expressions.
        * tradcpp.c (parse_answer): Assertions do not need to go to
        end of line in conditional directives.
        (parse_assertion): Get first character of identifiers correct.
        (test_assertion): New function.
        * tradcpp.h (test_assertion): New prototype.

From-SVN: r38011