java/bootstrap-openjdk*: Mark these ports as bundling libraries.

This prevents Pkg from recording the bundled libraries as
dependencies. This otherwise can confuse Pkg and Poudriere
about missing dependencies.

Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D53723

(cherry picked from commit 13f336375974eacab8d10a64c0d945d17acf1244)