luajit: enable smart strings

cmake/luajit.cmake

@@ -217,6 +217,7 @@ macro(luajit_build)
         add_definitions(-DLUAJIT_USE_ASAN=1)
         set (luajit_ldflags ${luajit_ldflags} -fsanitize=address)
     endif()
+    add_definitions(-DLUAJIT_SMART_STRINGS=1)
     # Add all COMPILE_DEFINITIONS to xcflags
     get_property(defs DIRECTORY PROPERTY COMPILE_DEFINITIONS)
     foreach(def ${defs})

luajit @ b8587faf

-Subproject commit 97699d9ee2467389b6aea21a098e38aff3469b5f
+Subproject commit b8587fafa36b417194b208d747e1f2be1faf19be