Enable locks on Linux targets.

DefineOptions.cmake

@@ -68,7 +68,7 @@ if (LINUXTEST)
   set(WITH_MEMORY_SPACE_AWARENESS ON)
   set(SEARCH_POLICY "best")
   set(FIT_PERCENTAGE 0.6f)
-  set(HAVE_LOCKS OFF)
+  set(HAVE_LOCKS ON)
   set(WITH_EXAMPLES ON)
   set(WITH_COALESCING "variable")
   set(MAX_COALESCE_SIZE 60000)