Cleanup the remaining of HAVE_UV_<func> macros

While cleaning up the usage of HAVE_UV_ macros, we forgot to cleanup the HAVE_UV_UDP_CONNECT in the actual code and HAVE_UV_TRANSLATE_SYS_ERROR and this was causing Windows build to fail on uv_udp_send() because the socket was already connected and we were falsely assuming that it was not.

The platforms with autoconf support were not affected, because we were still checking for the functions from the configure.