QUIC: allowed ngx_quic_frame_sendto() to return NGX_AGAIN. Previously, NGX_AGAIN returned by ngx_quic_send() was treated by ngx_quic_frame_sendto() as error, which triggered errors in its callers. However, a blocked socket is not an error. Now NGX_AGAIN is passed as is to the ngx_quic_frame_sendto() callers, which can safely ignore it.

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.