Updating package for Perl5 module Bit::Vector from CPAN in
devel/p5-Bit-Vector from 7.1nb2 to 7.2

pkgsrc changes:
- adjust Storable dependency (since Perl5 5.12.0 Storable 2.22 is shipped
  with core)

Upstream changes:
+  Fix compilation problems with perl 5.15.2-436-gbd31be4 and later;
    https://rt.perl.org/rt3/Public/Bug/Display.html?id=99408

(sno)