Force the use of the 'fork' start method on Python 3.14; this isn't a thing that should change on us.

Fixes #6213

bin/lutris

@@ -15,10 +15,15 @@
 
 import gettext
 import locale
+import multiprocessing
 import os
 import sys
 from os.path import dirname, normpath, realpath
 
+# Python 3.14 changes the default to 'forkserver' which is very different;
+# let's not put up with _that_!
+multiprocessing.set_start_method("fork")
+
 LAUNCH_PATH = dirname(realpath(__file__))
 
 # Prevent loading Python modules from home folder