The suffix is now "53" for all binaries. In Windows the executables were built using MingW, and they depend on MSVCRT.DLL.
The only change we do in the Lua source files is in the "luaconf.h" file at the LUA_CPATH_DEFAULT definition to add support for the "53" suffix in module names. Other files are only added to the standard distribution to compose the LuaBinaries packages.