cpplex.c (_cpp_lex_token): CPP_COMMENT and true CPP_EOF cases return without MI check.

        * cpplex.c (_cpp_lex_token): CPP_COMMENT and true CPP_EOF
        cases return without MI check.
        * cpplib.c (do_diagnostic): Take boolean of whether to
        print the directive name.
        (do_error, do_warning): Update.
        (do_pragma_dependency): Use it.
        * cpplib.h (VARARGS_FIRST): Delete.
        (struct cpp_token): Delete integer.
        * cppmacro.c (enter_macro_context): Move disabled check
        to _cpp_get_token.
        (_cpp_get_token): Simplify into a single loop.

From-SVN: r37434