Add system option to disable runtime

lutris/game.py

@@ -99,6 +99,13 @@ def prelaunch(self):
             return self.runner.prelaunch()
         return True
 
+    def use_runtime(self, system_config):
+        disable_runtime = system_config.get('disable_runtime')
+        env_runtime = os.getenv('LUTRIS_RUNTIME')
+        if env_runtime and env_runtime.lower() in ('0', 'off'):
+            disable_runtime = True
+        return not disable_runtime
+
     def play(self):
         """Launch the game."""
         if not self.runner:
@@ -145,7 +152,7 @@ def play(self):
             launch_arguments.insert(0, 'LD_PRELOAD="{}"'.format(ld_preload))
 
         ld_library_path = []
-        if os.getenv("LUTRIS_RUNTIME", 1) == 1:
+        if self.use_runtime(system_config):
             runtime64_path = os.path.join(settings.RUNTIME_DIR, "lib64")
             if os.path.exists(runtime64_path):
                 ld_library_path.append(runtime64_path)

lutris/sysoptions.py

@@ -25,6 +25,15 @@
                  "Lutris uses it to propose you a default path when you \n"
                  "install a new game.")
     },
+    {
+        'option': 'disable_runtime',
+        'type': 'bool',
+        'label': 'Disable Lutris Runtime',
+        'default': False,
+        'help': ("The Lutris Runtime loads some libraries before running the "
+                 "game. Which can cause some conflicts in some cases (mostly "
+                 "with Steam). Check this option to diasble it.")
+    },
     {
         'option': 'resolution',
         'type': 'choice',