Replace using of select() with poll()

[AGulev]

Task (REQUIRED):

Sometimes SDKs use more than 1024 FD, if the engine a game use API that uses select() under the hood at the same time, than the game crashes.

The engine uses select() in 6 files:
qsa.c - openAl/Alc
wsocket.c - luasocket
usocket.c - luasocket
net_sockets.c - mdedtls
sslsocket.c - dlib
socket.cpp - dlib

select() (doc) should be replaced with poll() (doc) to avoid this crash.

Expected outcome (REQUIRED):

No more crashes in such cases.
A couple of examples:

...
#00  pc 0000000000000668  [vdso] (__kernel_rt_sigreturn)
  #00  pc 000000000004e408  /apex/com.android.runtime/lib64/bionic/libc.so (abort+160)
  #00  pc 0000000000076c00  /apex/com.android.runtime/lib64/bionic/libc.so (__fortify_fatal(char const*, ...)+124)
  #00  pc 0000000000076b1c  /apex/com.android.runtime/lib64/bionic/libc.so (__FD_SET_chk+120)
  #00  pc 00000000001f4d08 (dmConnectionPool::ConnectSocket(dmConnectionPool::ConnectionPool*, dmSocket::Address, unsigned short, int, dmConnectionPool::Connection*, dmSocket::Result*)) (SourceCode: /home/runner/work/defold/defold/engine/dlib/build/../src/dlib/connection_pool.cpp:273)
...

One more crash:
https://github.com/defold/extension-poco/blob/master/poco/lua/defold-poco.lua#L146

[britzl]

wsocket.c - luasocket
usocket.c - luasocket

select() is used from the Lua function socket_select(). The best way forward would be to add support for a socket_poll() function.

https://github.com/diegonehab/luasocket

socket.cpp - dlib

Done!

sslsocket.cpp - dlib

Used by RecvTimeout() as a replacement for the default mbedtls_net_recv_timeout. I've tried switching from select to poll here but I'm getting SSL handshake timeouts when using equivalent code using poll instead of select.

net_sockets.c - mdedtls

We do not use any affected code from this file.

qsa.c - openAl/Alc

Not used. This backend has been removed in more recent versions of OpenAL: https://github.com/kcat/openal-soft/blob/master/ChangeLog#L157