recipes: add missing pkgconfig class inherits
recipes: add missing pkgconfig class inherits

* These recipes all use pkg-config in some way but were missing
  dependencies on the tool, this patch adds them.

Signed-off-by: Richard Purdie <3b7a1db6efedd40440bc6443bf377195011524e5@linuxfoundation.org>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

WindRiver-OpenSourceLabs/meta-webserver