[zlib] Add `pkg_pconfig_dirs` entry.
[zlib] Add `pkg_pconfig_dirs` entry.

Signed-off-by: Romain Sertelon <b8aabb4b95c817d9df69b6be95b2b94d6b1efe17@sertelon.fr>

be-plans/be,be-plans/be,be-plans/be,be-plans/be