QUIC: improved setting the lost timer. Setting the timer is brought into compliance with quic-recovery-34. Now it's set from a single function ngx_quic_set_lost_timer() that takes into account both loss detection and PTO. The following issues are fixed with this change: - when in loss detection mode, discarding a context could turn off the timer forever after switching to the PTO mode - when in loss detection mode, sending a packet resulted in rescheduling the timer as if it's always in the PTO mode

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


    cat << END                                            >> $NGX_MAKEFILE

$NGX_LIBATOMIC/src/libatomic_ops.a:	$NGX_LIBATOMIC/Makefile
	cd $NGX_LIBATOMIC && \$(MAKE)

$NGX_LIBATOMIC/Makefile:	$NGX_MAKEFILE
	cd $NGX_LIBATOMIC \\
	&& if [ -f Makefile ]; then \$(MAKE) distclean; fi \\
	&& ./configure

END