security/libressl: Backport change for missing EGD feature
- LibreSSL uses opensslfeatures.h to set defines for removed features
- RAND_egd support was removed before first portable release
- Change adds OPENSSL_NO_EGD define to make porting easier
- Change is part of coming 2.2.0 version
Approved by: vsevolod (maintainer, mentor), koobs (mentor)
Obtained from: OpenBSD
MFC after: 1 month