Changed the referent of a license summary.

Should refer to the CPAN::Meta::Spec for the license which can be specified.
And the License "perl" is indicated to be "perl_5” by CPAN::Meta::Spec.
Merge pull request #84 from avar/avar/remove-redundant-printf-arguments

ExtUtils::MM_Any: Get rid of unused printf arguments in dir_target
Merge pull request #85 from magnolia-k/master

Changed the referent of a license summary.
Release engineering for v6.87_02
ExtUtils::MM_Unix: Get rid of unused printf arguments in dynamic_bs

The issue with redundant printf arguments that I noted in
v6.67_01-222-g32a5d25 for ExtUtils::MM_Any::dir_target() also exists for
ExtUtils::MM_Unix::dynamic_bs(). Fix that very minor issue too by
getting rid of the unused arguments.

We've been passing the wrong number of arguments to this function every
since three of them were removed in v6.67_01-157-g1364164.