D25812: ECMFindQMLModule.cmake.in: Add ECM_DISABLE_QMLPLUGINDUMP to avoid sandbox violations

[Andreas Sturmlechner]

asturmlechner added a reviewer: Frameworks.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D25812

To: asturmlechner, #frameworks
Cc: kde-frameworks-devel, kde-buildsystem, LeGast00n, GB_2, bencreasy, 
michaelh, ngraham, bruns