devel/boost-python-libs: allow to install .cmake configs
for boost_python and boost_numpy libraries
in same way as it always doing for boot-libs package

Common for all flavors .cmake files will be installed only with default python version.
For all non-default flavors package will provide only versioned parts.

PR: 245560
Submitted by: fluffy
Reviewed by: lwhsu
Approved by: office (lwhsu)