Incorrect CMake files are produced when building from source without qttools

      perl init-repository --module-subset=qtbase,qtimageformats,qtsvg,qtwebsockets,qttranslations,qtrepotools,qtdeclarative

CMake Error at /usr/local/Qt-5.7.0/lib/cmake/Qt5Core/Qt5CoreConfig.cmake:15 (message):
  The imported target "Qt5::Core" references the file

     "/usr/local/Qt-5.7.0/bin/qdoc"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "/usr/local/Qt-5.7.0/lib/cmake/Qt5Core/Qt5CoreConfigExtras.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  /usr/local/Qt-5.7.0/lib/cmake/Qt5Core/Qt5CoreConfigExtras.cmake:41 (_qt5_Core_check_file_exists)
  /usr/local/Qt-5.7.0/lib/cmake/Qt5Core/Qt5CoreConfig.cmake:146 (include)
  /usr/local/Qt-5.7.0/lib/cmake/Qt5/Qt5Config.cmake:26 (find_package)
  CMakeLists.txt:40 (find_package)