fix(appimage): launch external processes with bundled linker

This ensures that external processes (including our updater and
Minecraft itself) maintain the same compatibility guarantees as the main
binary

Signed-off-by: Seth Flynn <getchoo@tuta.io>

launcher/FileSystem.h

@@ -4,6 +4,7 @@
  *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
  *  Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
  *  Copyright (C) 2022 Rachel Powers <508861+Ryex@users.noreply.github.com>
+ *  Copyright (C) 2025 Seth Flynn <getchoo@tuta.io>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -42,11 +43,13 @@
 
 #include <system_error>
 
+#include <QCoreApplication>
 #include <QDir>
 #include <QFlags>
 #include <QLocalServer>
 #include <QObject>
 #include <QPair>
+#include <QProcess>
 #include <QThread>
 
 namespace FS {
@@ -333,6 +336,14 @@ QString pathTruncate(const QString& path, int depth);
  */
 QString ResolveExecutable(QString path);
 
+/**
+ * Create a QProcess instance
+ *
+ * This wrapper is currently only required for wrapping binaries called in
+ * self-contained AppImages (like those created by `go-appimage`)
+ */
+std::unique_ptr<QProcess> createProcess(const QString& program, const QStringList& arguments);
+
 /**
  * Normalize path
  *