[tests] force POSIX::WNOHANG() autovivification (fixes #3110)
[tests] force POSIX::WNOHANG() autovivification (fixes #3110)

x-ref:
  "RPM build fails at Lighttest.pm"
  https://redmine.lighttpd.net/issues/3110

gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4