Don't force 'spawn' method, add explanation for workaround

package_manager/__init__.py

@@ -15,6 +15,10 @@ bl_info = {
 import logging
 log = logging.getLogger(__name__)
 
+# HACK:
+# due to lack of fork() on windows, multiprocessing will re-execute this module
+# in a new process. In such cases we only need subproc, everything else is only
+# used to spawn the subprocess in the first place.
 try:
     import bpy
 except ImportError:
@@ -50,7 +54,7 @@ else:
     from pathlib import Path
     from collections import OrderedDict
     import multiprocessing
-    mp_context = multiprocessing.get_context('spawn')
+    mp_context = multiprocessing.get_context()
     mp_context.set_executable(bpy.app.binary_path_python)
 
     # global list of all known packages, indexed by name