Fix build on Windows
Fix build on Windows

Signed-off-by: Martin Sustrik <4dd6061be1198639e8b05ce4fd5ead7a0dcaa0f4@250bpm.com>

yan97ao/nanomsg,wirebirdlabs/featherweight-nanomsg,krafczyk/nanomsg,wfxiang08/nanomsg,krafczyk/nanomsg,tempbottle/nanomsg,reqshark/nanomsg,ttyangf/nanomsg,kaostao/nanomsg,imp/nanomsg,nirs/nanomsg,reqshark/nanomsg,ttyangf/nanomsg,nirs/nanomsg,JackDunaway/featherweight-nanomsg,krafczyk/nanomsg,kaostao/nanomsg,tempbottle/nanomsg,gdamore/mamomsg,ttyangf/nanomsg,hyperfact/nanomsg,gdamore/mamomsg,TTimo/nanomsg,wirebirdlabs/featherweight-nanomsg,hyperfact/nanomsg,gdamore/mamomsg,modulexcite/nanomsg,linearregression/nanomsg,nirs/nanomsg,smithed/nanomsg,modulexcite/nanomsg,wfxiang08/nanomsg,featherweight/ftw-kernel-nanomsg,JackDunaway/featherweight-nanomsg,smithed/nanomsg,simplestbest/nanomsg,imp/nanomsg,linearregression/nanomsg,pch957/nanomsg,pakozm/nanomsg,simplestbest/nanomsg,zerotacg/nanomsg,ttyangf/nanomsg,modulexcite/nanomsg,TTimo/nanomsg,kaostao/nanomsg,pakozm/nanomsg,cosin2008/nanomsg.NET,yan97ao/nanomsg,hyperfact/nanomsg,featherweight/ftw-kernel-nanomsg,simplestbest/nanomsg,smithed/nanomsg,potatogim/nanomsg,cosin2008/nanomsg.NET,pch957/nanomsg,snikulov/nanomsg,TTimo/nanomsg,TTimo/nanomsg,zerotacg/nanomsg,pakozm/nanomsg,potatogim/nanomsg,JackDunaway/featherweight-nanomsg,zerotacg/nanomsg,reqshark/nanomsg,linearregression/nanomsg,yan97ao/nanomsg,tempbottle/nanomsg,cosin2008/nanomsg.NET,potatogim/nanomsg,imp/nanomsg,snikulov/nanomsg,smithed/nanomsg,kaostao/nanomsg,pch957/nanomsg,thisco-de/nanomsg,wirebirdlabs/featherweight-nanomsg,wfxiang08/nanomsg,thisco-de/nanomsg