skip PL_utf8locale

PL_utf8locale is set during init_i18nl10n if PerlIO is compiled in and on a utf8 locale
we do not need it here
fix $- init

wrong logic. skip if 0 or 60
C: set PL_exit_flags PERL_EXIT_DESTRUCT_END

as done in all perlmini.c files (except 5.6)