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.

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.