Configure tests if main can be linked to from getentropy compat.


git-svn-id: http://unbound.nlnetlabs.nl/svn/trunk@3191 be551aaa-1e26-0410-a405-d3ace91eadb9
autoconf on newer system.


git-svn-id: http://unbound.nlnetlabs.nl/svn/trunk@3192 be551aaa-1e26-0410-a405-d3ace91eadb9