Portage manages updates: turn off the launcher's self-update on Linux. The
launcher already handles this (no check at start, install buttons hidden,
a pointer to the releases page).

--- a/launcher/windows/BloodborneLauncher/Core/Updater.cs
+++ b/launcher/windows/BloodborneLauncher/Core/Updater.cs
@@ -470,7 +470,7 @@
 #if AVALONIA
         /// <summary>Whether this launcher can update itself: releases carry the Windows package and the
         /// Linux one (LanternEngine-v&lt;version&gt;-linux-x64.tar.gz, with this launcher inside).</summary>
-        public static bool Supported => OperatingSystem.IsWindows() || OperatingSystem.IsLinux();
+        public static bool Supported => OperatingSystem.IsWindows();
 
 #endif
         /// <summary>Removes the exe an update moved aside (it was still running then).</summary>