Don't use juce for handling VSTs in linux, it's broken

Use our own code instead

source/backend/plugin/VstPlugin.cpp

@@ -18,6 +18,12 @@
 #include "CarlaPluginInternal.hpp"
 #include "CarlaEngine.hpp"
 
+#if defined(CARLA_OS_LINUX) || defined(VESTIGE_HEADER)
+# define USE_JUCE_FOR_VST 0
+#else
+# define USE_JUCE_FOR_VST 1
+#endif
+
 #ifdef WANT_VST
 
 #include "CarlaVstUtils.hpp"
@@ -2456,7 +2462,7 @@ CarlaPlugin* CarlaPlugin::newVST(const Initializer& init)
     carla_debug("CarlaPlugin::newVST({%p, \"%s\", \"%s\"})", init.engine, init.filename, init.name);
 
 #ifdef WANT_VST
-# if 1 //defined(HAVE_JUCE) && ! defined(VESTIGE_HEADER)
+# if defined(HAVE_JUCE) && USE_JUCE_FOR_VST
     return newJuce(init, "VST");
 # else
     VstPlugin* const plugin(new VstPlugin(init.engine, init.id));

source/modules/juce_audio_processors/AppConfig.h

@@ -19,13 +19,17 @@
 
     @see VSTPluginFormat, AudioPluginFormat, AudioPluginFormatManager, JUCE_PLUGINHOST_AU
 */
-#define JUCE_PLUGINHOST_VST 1
+#ifndef VESTIGE_HEADER
+# define JUCE_PLUGINHOST_VST 1
+#else
+# define JUCE_PLUGINHOST_VST 0
+#endif
 
 /** Config: JUCE_PLUGINHOST_VST3
     Enables the VST3 audio plugin hosting classes. This requires the Steinberg VST3 SDK to be
     installed on your machine.
 
-    @see VSTPluginFormat, VVST3PluginFormat, AudioPluginFormat, AudioPluginFormatManager, JUCE_PLUGINHOST_VST, JUCE_PLUGINHOST_AU
+    @see VSTPluginFormat, VST3PluginFormat, AudioPluginFormat, AudioPluginFormatManager, JUCE_PLUGINHOST_VST, JUCE_PLUGINHOST_AU
 */
 #if defined(JUCE_WINDOW) || defined(JUCE_MAC)
 # define JUCE_PLUGINHOST_VST3 1