Fix compilation on Red Hat 5.x
Fix compilation on Red Hat 5.x

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

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