Warning from Standards.PKCS with old Nettle.
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=7588
Reported by @grubba
c:/disttest/install test/ep_6_0/server-6.0.74/pike/lib/modules/Standards.pmod/PKCS.pmod/module.pmod:75: Warning: ECDSA is private but not used anywhere.