D19075: Fix FindEGL

[Tobias C. Berner]

tcberner added a reviewer: FreeBSD.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D19075

To: tcberner, #automotive, hausmann, #freebsd
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns