Don't store the Wine version as a field

It's only needed for the initialisation message, and it doesn't throw so
doing this later shouldn't make a difference.

src/plugin/bridges/vst2.cpp

@@ -61,7 +61,6 @@ Vst2PluginBridge::Vst2PluginBridge(audioMasterCallback host_callback)
       // This weird cast is not needed, but without it clang/ccls won't shut up
       logger(static_cast<Vst2Logger&&>(Logger::create_from_environment(
           create_logger_prefix(sockets.base_dir)))),
-      wine_version(get_wine_version()),
       vst_host(
           config.group
               ? std::unique_ptr<HostProcess>(std::make_unique<GroupHost>(
@@ -646,7 +645,7 @@ void Vst2PluginBridge::log_init_message() {
     }
     init_msg << "'" << std::endl;
 
-    init_msg << "wine version: '" << wine_version << "'" << std::endl;
+    init_msg << "wine version: '" << get_wine_version() << "'" << std::endl;
     init_msg << std::endl;
 
     // Print the path to the currently loaded configuration file and all

src/plugin/bridges/vst2.h

@@ -172,12 +172,6 @@ class Vst2PluginBridge {
      */
     Vst2Logger logger;
 
-    /**
-     * The version of Wine currently in use. Used in the debug output on plugin
-     * startup.
-     */
-    const std::string wine_version;
-
     /**
      * The Wine process hosting the Windows VST plugin.
      *