require perl-5.10.0 instead of perl-5.8.9

Perl 5.8.9's "warnings" pragma uses "Carp", which calls eval(). Since "use
warnings" is (rightfully imho) a default in the D2::T::TextTemplate's
"prepend" option, and since eval() is (even more rightfully) forbidden by
default in a Safe compartment, I see no other solution.
v1.002

    - require perl-5.10.0 instead of perl-5.8.9:
      Perl 5.8.9's "warnings" pragma uses "Carp", which calls eval(). Since
      "use warnings" is (rightfully imho) a default in the
      D2::T::TextTemplate's "prepend" option, and since eval() is (even more
      rightfully) forbidden by default in a Safe compartment, I see no other
      solution.