Fix wine forward initialization order

`io_context.run()` returns if there is no more work to do, so it should
be called only after we give it something to do.

src/plugin/host-bridge.cpp

@@ -124,11 +124,11 @@ HostBridge::HostBridge(audioMasterCallback host_callback)
                               std::pair<Logger&, bool>(logger, false));
         }
     });
-    wine_io_handler = std::thread([&]() { io_context.run(); });
 
     // Print the Wine host's STDOUT and STDERR streams to the log file
     async_log_pipe_lines(wine_stdout, wine_stdout_buffer, "[Wine STDOUT] ");
     async_log_pipe_lines(wine_stderr, wine_stderr_buffer, "[Wine STDERR] ");
+    wine_io_handler = std::thread([&]() { io_context.run(); });
 
     // Read the plugin's information from the Wine process. This can only be
     // done after we started accepting host callbacks as the plugin might do

src/plugin/host-bridge.h

@@ -131,11 +131,6 @@ class HostBridge {
      * The thread that handles host callbacks.
      */
     std::thread host_callback_handler;
-    /**
-     * Runs the Boost.Asio `io_context` thread for logging the Wine process
-     * STDOUT and STDERR messages.
-     */
-    std::thread wine_io_handler;
 
     /**
      * The callback function passed by the host to the VST plugin instance.
@@ -153,6 +148,12 @@ class HostBridge {
      * The STDERR stream of the Wine process we can forward to the logger.
      */
     boost::process::async_pipe wine_stderr;
+    /**
+     * Runs the Boost.Asio `io_context` thread for logging the Wine process
+     * STDOUT and STDERR messages.
+     */
+    std::thread wine_io_handler;
+
     /**
      * The Wine process hosting the Windows VST plugin.
      */