Patches to squid for kernel AIO on FreeBSD

All patches are for squid 2.4.STABLE2.

(1) Patch to rename functions similar to squid-HEAD-2.5; needed for (2) and (3). No intellectual contents, only renamings.
(2) Patch to implement AIO reading
(3) Patch to add extended logging to functionality from previous patch

Related stuff: Patch to kernel AIO implementation - access by group and visible request rate