D14457: Forward-declare X509 structure

[Nathaniel Graham]

ngraham added reviewers: Frameworks, cfeck.

REPOSITORY
  R239 KDELibs4Support

REVISION DETAIL
  https://phabricator.kde.org/D14457

To: luc4, #frameworks, cfeck
Cc: kde-frameworks-devel, michaelh, ngraham, bruns