Qt4: make pro files generated for translations easier to read

-use one line for each input file and include directory
-remove duplicate include directories

Modules/Qt4Macros.cmake

@@ -432,15 +432,16 @@ macro(QT4_CREATE_TRANSLATION _qm_files)
        set(_ts_pro ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${_ts_name}_lupdate.pro)
        set(_pro_srcs)
        foreach(_pro_src ${_my_sources})
-         set(_pro_srcs "${_pro_srcs} \"${_pro_src}\"")
+         set(_pro_srcs "${_pro_srcs} \\\n  \"${_pro_src}\"")
        endforeach()
        set(_pro_includes)
        get_directory_property(_inc_DIRS INCLUDE_DIRECTORIES)
+       list(REMOVE_DUPLICATES _inc_DIRS)
        foreach(_pro_include ${_inc_DIRS})
          get_filename_component(_abs_include "${_pro_include}" ABSOLUTE)
-         set(_pro_includes "${_pro_includes} \"${_abs_include}\"")
+         set(_pro_includes "${_pro_includes} \\\n  \"${_abs_include}\"")
        endforeach()
-       file(WRITE ${_ts_pro} "SOURCES = ${_pro_srcs}\nINCLUDEPATH = ${_pro_includes}\n")
+       file(WRITE ${_ts_pro} "SOURCES =${_pro_srcs}\nINCLUDEPATH =${_pro_includes}\n")
      endif()
      add_custom_command(OUTPUT ${_ts_file}
         COMMAND ${QT_LUPDATE_EXECUTABLE}