Import r2052

Update to latest Csocket

This fixes a bug where the wrong errno value was used for SockError(). This also
fixes a busy loop caused by broken c-ares timeout handling on our side.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/branches/0.090_fixes@2053 726aef4b-f618-498e-8847-2d620e286838