companion for cyclus/cyclus#912

```
08:56 ~/work/cyclus/cycamore [atbuild|…9]$ ldd ~/.local/lib/cyclus/libcycamore.so | grep test
08:56 ~/work/cyclus/cycamore [atbuild|…9]$ ldd ~/.local/bin/cycamore_unit_tests | grep test
	libgtest.so => /home/gidden/.local/lib/libgtest.so (0x00007f8654198000)
	libbaseagentunittests.so => /home/gidden/.local/lib/cyclus/libbaseagentunittests.so (0x00007f8653f36000)
```