FindQt4: Use NO_CMAKE_FIND_ROOT_PATH where search paths are already rooted.
Merge topic 'qt4-find-root' into next

28f8ee4 FindQt4: Use NO_CMAKE_FIND_ROOT_PATH where search paths are already rooted.
FindQt4: Use NO_CMAKE_FIND_ROOT_PATH where search paths are already rooted.

Thanks to Thomas Petazzoni for part of this fix.
Merge topic 'qt4-find-root' into next

e8b8b37 FindQt4: Use NO_CMAKE_FIND_ROOT_PATH where search paths are already rooted.