[cmake, desktop] Fix <6.9 build error and quazip fetching (#67)

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/67

src/yuzu/main.cpp

@@ -4443,7 +4443,7 @@ void GMainWindow::OnInstallFirmwareFromZIP()
                 QMessageBox::warning(this, tr("Firmware cleanup failed"),
                                       tr("Failed to clean up extracted firmware cache.\n"
                                          "Check write permissions in the system temp directory and try again.\nOS reported error: %1")
-                                     .arg(ec.message()));
+                                     .arg(QString::fromStdString(ec.message())));
         }
 
         return;