QUIC: removed ngx_send_lowat() check for QUIC connections. After 9ae239d2547d, ngx_quic_handle_write_event() no longer runs into ngx_send_lowat() for QUIC connections, so the check became excessive. It is assumed that external modules operating with SO_SNDLOWAT (I'm not aware of any) should do this check on their own.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have