FindQAD multiple add target fix

qad/cmake/FindQAD.cmake

@@ -101,6 +101,7 @@ foreach(_Q ${_QAD_LIBS})
 	set(_target QAD::${_ITN_${_Q}})
 	string(REPLACE ":" "_" _target_str "${_target}")
 	foreach(_v ${_QT_VERSIONS_})
+		if(NOT TARGET ${_target}${_v})
 			set(_link_list)
 			foreach(_l ${_ITLL_${_Q}})
 				list(APPEND _link_list ${_l}${_v})
@@ -116,6 +117,7 @@ foreach(_Q ${_QAD_LIBS})
 			endif()
 			#message(STATUS "add imported ${_target}${_v}")
 			#message(STATUS "add MULTILIB MULTILIB_${_target_str}_SUFFIX_Qt${_v} ${_v}")
+		endif()
 	endforeach()
 	list(APPEND QT_MULTILIB_LIST ${_target})
 endforeach()