need to declare that utf8-encoded bytes lie ahead
On just 5.10.0 (not 5.10.1!), t/11-shebang-C.t fails

e.g.  http://www.cpantesters.org/cpan/report/558556a6-f15b-11e3-91af-b13c75ee6823
It looks like flags were interpreted really really badly there!
Dist-Zilla-Plugin-Test-Compile-2.043

 - fix remaining failures on 5.10.0 (due to buggy -C flags) introduced in
   2.041