Binary utilities for Firewall Builder

These utilities are needed for the Windows build of Firewall Builder.

Please verify sha512sum and gpg signature.

$ gpg --verify SHA512SUMS.sig SHA512SUMS
$ sha512sum -c SHA512SUMS

GNU RCS

Retrieved from the previous Firewall Builder installer

PSCP and Plink

Retrieved from http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

$ gpg --verify plink.exe.gpg plink.exe
$ gpg --verify pscp.exe.gpg pscp.exe