Fixed --test-build-*. Fixes various aspects of --test-build-devpoll, --test-build-eventport, and --test-build-epoll. In particular, if --test-build-devpoll was used on Linux, then "devpoll" event method would be preferred over "epoll". Also, wrong definitions of event macros were chosen.

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.