Limit poll migration to functional C++ changes and drop rebuilt binaries from PR

[Copilot]

This update narrows the PR to the intended functional change only: replacing select()-based waits with poll() in the affected connection paths. It removes unintended binary refreshes and whitespace-only churn so review focuses on behavior changes.

• Scope cleanup (no binary artifacts)

  • Excludes regenerated binaries/libraries from the proposed diff.
  • Keeps repository binary state unchanged relative to base for this PR.

• Functional update: LanConnection

  • /src/libUnifiedLanComm/src/LanConnection.cpp
  • Uses poll() on non-Windows instead of select().
  • Captures socket under lock before waiting, with early invalid-FD handling.
  • Retries on EINTR.
  • Clamps timeout conversion to INT_MAX before passing to poll().

• Functional update: UpstreamCharConnection

  • /src/multimacd/UpstreamCharConnection.cpp
  • Replaces loop-local select() fd-set flow with pollfd-based waiting.
  • Handles invalid FD explicitly.
  • Preserves existing event handling logic while switching readiness checks to poll revents.

pollfd pfd;
pfd.fd = currentSock;
pfd.events = POLLIN | POLLPRI | POLLERR | POLLHUP;
pfd.revents = 0;

int pollTimeout = (msTimeout > (unsigned int)INT_MAX) ? INT_MAX : (int)msTimeout;
do {
  nEvents = poll(&pfd, 1, pollTimeout);
} while (nEvents < 0 && errno == EINTR);