BUG/MINOR: hlua: use a local buffer to format the socket addresses

BUG/MINOR: hlua: use a local buffer to format the socket addresses

hlua_socket_info() formats the peer or local address of a Lua socket into
a function-static buffer shared by all threads. But there's no reason for
this buffer to be static, and it can cause inter-thread corruption. Let's
just drop the static modifier so that the address lies in the stack.

It can be backported to all versions since it's been there since 1.6
when sockets were introduced to Lua.

Reported-by: Claude (ANT-2026-W66XVDTK)