add hook for pyinstaller to copy shared lib to correct place in packaged executable

Author: mhkline

setup.cfg

@@ -1,3 +1,8 @@
+# Entry Points for PyInstaller
+[options.entry_points]
+pyinstaller40 =
+    hook-dirs = libusb_package.__pyinstaller:get_hook_dirs
+
 [metadata]
 name = libusb-package
 description = Package containing libusb so it can be installed via Python package managers

src/libusb_package/__pyinstaller/__init__.py

@@ -0,0 +1,4 @@
+import os
+
+def get_hook_dirs():
+    return [os.path.dirname(__file__)]

src/libusb_package/__pyinstaller/hook-libusb_package.py

@@ -0,0 +1,4 @@
+from PyInstaller.utils.hooks import collect_dynamic_libs
+
+# copy the libusb shared library to the package root directory
+binaries = collect_dynamic_libs('libusb_package', destdir='.')