Unnecessary casts to double for nhits, num_misses, mem_size, seg_size, avail_mem in helper methods

[TysonAndre]

(For apcu_sma_info and apc_cache_info)

This doesn't really affect me, it's just surprising

See https://github.com/krakjoe/apcu/blob/master/tests/apcu_sma_info.phpt#L20

Those are internally represented as a zend_long for many of these, making the cast unnecessary, and the majority of installations would be 64-bit anyway. I'm not sure if this is a holdover to let it work for 32-bit builds (x32) on 64-bit oses

• add_assoc_double was part of the initial import : 4639e9b