Internal pyinstaller hook (Fixes #1514)

Makes sure that pyinstaller gets all the required libraries when bundling pygame 2 projects into an exe.

setup.cfg

@@ -19,3 +19,7 @@ commands =
 [pylint.MESSAGES CONTROL]
 extension-pkg-whitelist=pygame
 disable=useless-object-inheritance
+
+[options.entry_points]
+pyinstaller40 =
+	hook-dirs = pygame.__pyinstaller:get_hook_dirs

setup.py

@@ -792,13 +792,15 @@ def run(self):
                        'pygame.tests.run_tests__tests.timeout',
                        'pygame.tests.run_tests__tests.everything',
                        'pygame.docs',
-                       'pygame.examples'],
+                       'pygame.examples',
+                       'pygame.__pyinstaller'],
        "package_dir": {'pygame': 'src_py',
                        'pygame._sdl2': 'src_py/_sdl2',
                        'pygame.threads': 'src_py/threads',
                        'pygame.tests': 'test',
                        'pygame.docs': 'docs',
-                       'pygame.examples': 'examples'},
+                       'pygame.examples': 'examples',
+                       'pygame.__pyinstaller': 'src_py/__pyinstaller'},
        "headers":     headers,
        "ext_modules": extensions,
        "data_files":  data_files,

src_py/__pyinstaller/__init__.py

@@ -0,0 +1,5 @@
+import os
+
+
+def get_hook_dirs():
+    return [os.path.dirname(__file__)]

src_py/__pyinstaller/hook-pygame.py

@@ -0,0 +1,19 @@
+"""
+binaries hook for pygame seems to be required for pygame 2.0 Windows.
+Otherwise some essential DLLs will not be transfered to the exe.
+"""
+
+import platform
+
+if platform.system() == "Windows":
+
+    from PyInstaller.utils.hooks import collect_dynamic_libs
+
+    pre_binaries = collect_dynamic_libs('pygame')
+    binaries = []
+
+    for b in pre_binaries:
+        binary, location = b
+        # settles all the DLLs into the top level folder, which prevents duplication
+        # with the DLLs already being put there.
+        binaries.append((binary, "."))