Allow to build with BSD make

Summary:
The linker step doesn't include the fbsql compiled object code.

This fixes the following issue when built with BSD Make:
cannot find symbol "Fbsql_Init": Undefined symbol "_Fbsql_Init"

This is a follow-up for 0dfc69538776.

Test Plan:

• make then load in TCL interpreter with load ./fbsql.so
• gmake then load

Differential Revision: https://devcentral.nasqueron.org/D3913