[Seobeo] Linux epoll. Set the client socket to be nonblocking so that it doesn't stop loading when two different threads handle different client calls. I might have problem with socket not being cleaned up properly so need to check that.

config_setting(
  name        = "macos",
  constraint_values = ["@platforms//os:osx"],
)

config_setting(
  name        = "linux",
  constraint_values = ["@platforms//os:linux"],
)