Log Message:
* Teach devel/p5-Module-Build to write .packlists just like MakeMaker.pm
  does.  This allows us to use dynamic PLISTs for Perl modules that are
  built using Module::Build.  Bump the PKGREVISION of p5-Module-Build
  to 1.

* Drop the use of PERL5_USES_MODULE_BUILD and introduce a new variable
  PERL5_MODULE_TYPE that is either "MakeMaker" or \ 
"Module::Build" that
  names the framework used to build/install the module.

* Split out the variables set in perl5/buildlink3.mk that are also used
  by perl5/module.mk into a new file perl5/vars.mk.  Move some PERL5_*
  variable definitions from pkgsrc/mk/bsd.pkg.use.mk into perl5/vars.mk.
  This just centralizes the common PERL5_* definitions into a single
  file location.

* Convert the known packages that use Module::Build to set
  PERL5_MODULE_TYPE and PERL5_PACKLIST:

	devel/p5-Class-Container
	devel/p5-Exception-Class
	devel/p5-Log-Dispatch
	devel/p5-Array-Compare
	textproc/p5-Pod-Coverage
	www/p5-Apache-Session-Wrapper
	www/p5-MasonX-Request-WithApacheSession