2nd Fixup for a548227: install QT translation files again

QT provided QM files in QM_FILES got overwritten by the
invokation of the translation function.
Put them into a different variable.

lang/CMakeLists.txt

@@ -13,7 +13,7 @@ foreach(lang ${XCA_LANGUAGES})
   set(LANG_COMPS "  <Component Id=\"Ci18n.${lang}\" Guid=\"${GUID}\">
     <File Id=\"xca_${lang}.qm\" Source=\"${D}/xca_${lang}.qm\" KeyPath=\"yes\"/>\n")
   if(EXISTS ${_qt_bin_dir}/../translations/qt_${lang}.qm)
-    list(APPEND QM_FILES ${_qt_bin_dir}/../translations/qt_${lang}.qm)
+    list(APPEND QT_QM_FILES ${_qt_bin_dir}/../translations/qt_${lang}.qm)
     string(APPEND LANG_COMPS "    <File Id=\"qt_${lang}.qm\" Source=\"${_qt_bin_dir}/../translations/qt_${lang}.qm\"/>\n")
   endif()
   string(APPEND LANG_COMPS "  </Component>\n")
@@ -43,15 +43,15 @@ else()
   )
   add_custom_target(trans DEPENDS xca_lupdate "${D}/xca.pot")
 endif()
-list(APPEND APP_RESOURCES ${QM_FILES} ${LANG_DIRS})
-target_sources(${CMAKE_PROJECT_NAME} PRIVATE ${QM_FILES})
+list(APPEND APP_RESOURCES ${QM_FILES} ${QT_QM_FILES} ${LANG_DIRS})
+target_sources(${CMAKE_PROJECT_NAME} PRIVATE ${QM_FILES} ${QT_QM_FILES})
 
 if (UNIX AND NOT APPLE)
   install(FILES ${QM_FILES}
 	DESTINATION ${CMAKE_INSTALL_DATADIR}/${CMAKE_PROJECT_NAME}/i18n
   )
 elseif(WIN32)
-  install(FILES ${QM_FILES}
+  install(FILES ${QM_FILES} ${QT_QM_FILES}
 	  DESTINATION ${RUNTIME_DEST}/i18n
   )
 endif()