[Enhancement] Allow bounded queue size to exceed 65,535 for 64bit systems

in https://github.com/boostorg/lockfree/blob/develop/include/boost/lockfree/detail/freelist.hpp lines 335 and 369, replace the numeric const with compile time const derived from 32bit vs. 64bit compilation
(e.g. `#if __x86_64__ || __ppc64__` )

Start in include/boost/lockfree/detail/freelist.hpp at lines 335 and 369, and inspect the numeric constants and nearby platform-related definitions. Replace the fixed limit with a compile-time value based on 32-bit versus 64-bit compilation, then verify that bounded queues can exceed 65,535 on 64-bit systems while retaining the existing 32-bit limit.

Written by the indexing model from the issue text.