Tell setup to include Empirical

setup.py

@@ -4,6 +4,7 @@
 # Available at setup time due to pyproject.toml
 from pybind11.setup_helpers import Pybind11Extension, build_ext
 from setuptools import setup
+import glob
 
 __version__ = "0.2.2"
 
@@ -18,7 +19,7 @@
 
 ext_modules = [
     Pybind11Extension("phylotrackpy.systematics",
-        ["systematics_bindings.cpp"],
+        ["systematics_bindings.cpp"] + sorted(glob.glob("Empirical/**", recursive=True)),
         # Example: passing in the version to the compiled code
         define_macros = [('VERSION_INFO', __version__), ("EMP_OPTIONAL_THROW_ON", 1)],
         cxx_std=20