proton: Add noesync,nofsync for Apex Legends

proton

@@ -911,6 +911,16 @@ def comma_escaped(s):
         idx = idx - 1
     return escaped
 
+#hopefully short-lived, app-specific workarounds for Proton bugs
+def default_compat_config():
+    ret = set()
+    if "SteamAppId" in os.environ:
+        appid = os.environ["SteamAppId"]
+        if appid == "1172470": #Apex Legends
+            ret.add("noesync")
+            ret.add("nofsync")
+    return ret
+
 class Session:
     def __init__(self):
         self.log_file = None
@@ -922,7 +932,7 @@ class Session:
                 "beclient_x64.dll": "b,n",
         }
 
-        self.compat_config = set()
+        self.compat_config = default_compat_config()
         self.cmdlineappend = []
 
         if "STEAM_COMPAT_CONFIG" in os.environ: