Build fbsql.so for ViperServ

Summary:
Software is available in the rFBSQL repository, with a correct Makefile for FreeBSD.

See https://www.fastbase.co.nz/fbsql/index.html for software information.

Ref T1309.

Test Plan: Run tclsh and load fbsql.so + sql connect

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1309

Differential Revision: https://devcentral.nasqueron.org/D1211