Merge pull request #12155 from compnerd/quoting

Author: swift-ci

cmake/modules/AddSwift.cmake

@@ -497,7 +497,7 @@ endfunction()
 function(swift_target_link_search_directories target directories)
   set(STLD_FLAGS "")
   foreach(directory ${directories})
-    set(STLD_FLAGS "${STLD_FLAGS} ${CMAKE_LIBRARY_PATH_FLAG}${directory}")
+    set(STLD_FLAGS "${STLD_FLAGS} \"${CMAKE_LIBRARY_PATH_FLAG}${directory}\"")
   endforeach()
   set_property(TARGET ${target} APPEND_STRING PROPERTY LINK_FLAGS ${STLD_FLAGS})
 endfunction()