message: Added missing "libwinpthread-1.dll" library to MINGW build.
  This change makes it possible to run the executables in the "out" directory without using QtCreator.
diff: @@ -91,7 +91,7 @@ function(windeployqt target directory)
  if( MINGW )
  message( STATUS " Installing system-libraries: MinGW DLLs." )
  get_filename_component( Mingw_Path ${CMAKE_CXX_COMPILER} PATH )
  - set( CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS ${Mingw_Path}/libgcc_s_dw2-1.dll ${Mingw_Path}/libstdc++-6.dll )
  + set( CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS ${Mingw_Path}/libgcc_s_dw2-1.dll ${Mingw_Path}/libstdc++-6.dll ${Mingw_Path}/libwinpthread-1.dll )
  endif( MINGW )
  # windeployqt doesn't work correctly with the system runtime libraries,
  # so we fall back to one of CMake's own modules for copying them over
  