D6249: FindQHelpGenerator: avoid picking up Qt4 version

[Michael Palimaka]

palimaka created this revision.
Restricted Application added projects: Frameworks, Build System.
Restricted Application added a subscriber: Build System.

REVISION SUMMARY
  Passing NO_DEFAULT_PATH ignores $PATH and ensures that we use the
  previously-detected Qt5 binary path.

TEST PLAN
  qhelpgenerator is now picked up from the same location as Qt5::qmake. Before,
  anything in $PATH was preferred even if it was the Qt 4 version.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6249

AFFECTED FILES
  find-modules/FindQHelpGenerator.cmake

To: palimaka, #frameworks
Cc: #build_system
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