Fix mis-merging in AddLLVM.cmake, take #2. LINK.EXE's options had been broken. Sorry again.

llvm-svn: 198169
diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index a990ca4..9bcf00e 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -49,7 +49,7 @@
                    LINK_FLAGS "${CMAKE_CURRENT_BINARY_DIR}/${native_export_file}")
     else()
       set_property(TARGET ${target_name} APPEND_STRING PROPERTY
-                   LINK_FLAGS " ${CMAKE_CURRENT_BINARY_DIR}/${native_export_file}")
+                   LINK_FLAGS "/DEF:${CMAKE_CURRENT_BINARY_DIR}/${native_export_file}")
     endif()
   endif()