With LibreSSL-3.8.1 these engines are no long available causing a build
failure, but LibreSSL correctly defines OPENSSL_NO_ENGINE as part of its
opensslfeatures.h. However Tor includes crypto_openssl_mgt.h before any
of the openssl includes which would define OPENSSL_NO_ENGINE and then
fails to define DISABLE_ENGINES.

As the define is used in only a single .c file it is best to move it
there.

Signed-off-by: orbea <orbea@riseup.net>