Link native to core on OSX only

Author: nyalldawson

src/core/CMakeLists.txt

@@ -1113,7 +1113,9 @@ IF (WIN32)
   TARGET_LINK_LIBRARIES(qgis_core wsock32 ${SETUPAPI_LIBRARY} DbgHelp)
 ENDIF (WIN32)
 
-TARGET_LINK_LIBRARIES(qgis_core qgis_native)
+IF (APPLE)
+  TARGET_LINK_LIBRARIES(qgis_core qgis_native)
+ENDIF (APPLE)
 
 IF (NOT WITH_INTERNAL_QEXTSERIALPORT)
   TARGET_LINK_LIBRARIES(qgis_core ${QEXTSERIALPORT_LIBRARY})