benchmarks/polygraph builds fine with OpenSSL 1.1.1

While here set EXTRACT_SUFX instead of WRKSRC and DISTVERSIONSUFFIX
to avoid having to fix WRKSRC afterwards.

http://beefy12.nyi.freebsd.org/data/head-amd64-default/p485718_s340864/logs/polygraph-4.13.0.log