net/rabbiteer: fix openssl 1.1.1 breakage

Upstream uses a library that uses a library that provides OpenSSL
bindings, in a way that is unlikely to be addressed. Purge the SSL
patches until such time as a replacement is available.

Approved by: jrm (mentor)
MFH: 2018Q4
Differential Revision: https://reviews.freebsd.org/D17939