QUIC: do not call shutdown() when handshake is in progress. Instead, when worker is shutting down and handshake is not yet completed, connection is terminated immediately. Previously the callback could be called while QUIC handshake was in progress and, what's more important, before the init() callback. Now it's postponed after init(). This change is a preparation to postponing HTTP/3 session creation to init().

make -f misc/GNUmakefile release

the required tools:
*) xsltproc to build CHANGES,
*) xslscript.pl ( http://hg.nginx.org/xslscript ) to build XSLTs
   from XSLScript sources.


make -f misc/GNUmakefile icons

the required tool:
*) netpbm to create Win32 icons from xpm sources.