CMake: optional show LGPLv2.1 license when install cmake-gui component

In IFW installer if cmake-gui component selected and
CMake_GUI_DISTRIBUTE_WITH_Qt_LGPL enabled license will be
showed.

CMakeCPack.cmake

@@ -82,6 +82,8 @@ if(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
     endif()
     if(BUILD_QtDialog)
       list(APPEND _CPACK_IFW_COMPONENTS_ALL cmake-gui)
+      set(_CPACK_IFW_COMPONENT_CMAKE-GUI_LICENSES "set(CPACK_IFW_COMPONENT_CMAKE-GUI_LICENSES
+    \"LGPLv2.1\" \"${CMake_SOURCE_DIR}/Licenses/LGPLv2.1.txt\")")
     endif()
     if(SPHINX_MAN)
       list(APPEND _CPACK_IFW_COMPONENTS_ALL sphinx-man)
@@ -100,6 +102,11 @@ if(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
   set(CPACK_COMPONENTS_ALL \"${_CPACK_IFW_COMPONENTS_ALL}\")
   set(CPACK_COMPONENTS_GROUPING IGNORE)
 ")
+  else()
+    if(BUILD_QtDialog AND CMake_GUI_DISTRIBUTE_WITH_Qt_LGPL)
+      set(_CPACK_IFW_ADDITIONAL_LICENSES
+        "\"LGPLv2.1\" \"${CMake_SOURCE_DIR}/Licenses/LGPLv2.1.txt\"")
+    endif()
   endif()
 
   # Components scripts configuration

CMakeCPackOptions.cmake.in

@@ -62,7 +62,8 @@ if(CPACK_GENERATOR MATCHES "IFW")
   set(CPACK_IFW_COMPONENT_GROUP_CMAKE_VERSION
     "@_CPACK_IFW_PACKAGE_VERSION@")
   set(CPACK_IFW_COMPONENT_GROUP_CMAKE_LICENSES
-    "@CPACK_PACKAGE_NAME@ Copyright" "@CPACK_RESOURCE_FILE_LICENSE@")
+    "@CPACK_PACKAGE_NAME@ Copyright" "@CPACK_RESOURCE_FILE_LICENSE@"
+    @_CPACK_IFW_ADDITIONAL_LICENSES@)
   set(CPACK_IFW_COMPONENT_GROUP_CMAKE_SCRIPT "@_CPACK_IFW_PACKAGE_SCRIPT@")
   set(CPACK_IFW_COMPONENT_GROUP_CMAKE_PRIORITY 100)
 
@@ -115,6 +116,7 @@ if(CPACK_GENERATOR MATCHES "IFW")
   set(CPACK_IFW_COMPONENT_CMAKE-GUI_SCRIPT
     "@CMake_SOURCE_DIR@/Source/QtIFW/CMake.Dialogs.QtGUI.qs")
   set(CPACK_IFW_COMPONENT_CMAKE-GUI_VERSION "@_CPACK_IFW_PACKAGE_VERSION@")
+  @_CPACK_IFW_COMPONENT_CMAKE-GUI_LICENSES@
 
   set(CPACK_COMPONENT_CCMAKE_DISPLAY_NAME "ccmake")
   set(CPACK_COMPONENT_CCMAKE_GROUP Dialogs)