dist: Include `_sysconfigdata` module properly

Fixes #1326

direct/src/dist/FreezeTool.py

@@ -1215,6 +1215,18 @@ class Freezer:
                 else:
                     self.__loadModule(self.ModuleDef(modname, implicit = True))
 
+        # Special case for sysconfig, which depends on a platform-specific
+        # sysconfigdata module on POSIX systems.
+        if 'sysconfig' in self.mf.modules:
+            if sys.version_info >= (3, 6):
+                if 'linux' in self.platform:
+                    arch = self.platform.split('_', 1)[1]
+                    self.__loadModule(self.ModuleDef('_sysconfigdata__linux_' + arch + '-linux-gnu', implicit=True))
+                elif 'mac' in self.platform:
+                    self.__loadModule(self.ModuleDef('_sysconfigdata__darwin_darwin', implicit=True))
+            elif 'linux' in self.platform or 'mac' in self.platform:
+                self.__loadModule(self.ModuleDef('_sysconfigdata', implicit=True))
+
         # Now, any new modules we found get added to the export list.
         for origName in list(self.mf.modules.keys()):
             if origName not in origToNewName:

makepanda/makewheel.py

@@ -687,6 +687,21 @@ __version__ = '{0}'
 
             whl.write_file(target_path, source_path)
 
+    # Include the special sysconfigdata module.
+    if os.name == 'posix':
+        import sysconfig
+
+        if hasattr(sysconfig, '_get_sysconfigdata_name'):
+            modname = sysconfig._get_sysconfigdata_name() + '.py'
+        else:
+            modname = '_sysconfigdata.py'
+
+        for entry in sys.path:
+            source_path = os.path.join(entry, modname)
+            if os.path.isfile(source_path):
+                whl.write_file('deploy_libs/' + modname, source_path)
+                break
+
     # Add plug-ins.
     for lib in PLUGIN_LIBS:
         plugin_name = 'lib' + lib