Log Message:
security/ruby-bcrypt: update to 3.1.19

pkgsrc change: remove redundunt PKGNAME.

3.1.19 (2019-05-31)

* No longer include compiled binaries for Windows. See GH #173.
* Update C and Java implementations to latest versions [GH #182 by @fonica]
* Bump default cost to 12 [GH #181 by @bdewater]
* Remove explicit support for Rubies 1.8 and 1.9
* Start calibration from the minimum cost supported by the algorithm [GH
  #206 by @sergey-alekseev]
* Remove explicit support for Rubies 1.8 and 1.9 [GH #185 by @tjschuck]
* Define SKIP_GNU token when building extension (Fixes FreeBSD >= 12) [GH
  #189 by @adam12]