Avoid double-linking Boost on Windows

The `lockfree_fifo` test links both Boost explicitly and does not mitigate
Boost's auto-linking.

This results in symbol conflicts at link time thanks to autolink selecting
static libraries and HPX selecting dynamic libraries. As autolink is more
aligned with the settings the library uses, this commit avoids linking
Boost manually.
Merge pull request #1259 from zao/autolink_lockfree_fifo_test

Avoid double-linking Boost on Windows