Fix LTO build if vst2 MIDI stuff is properly defined elsewhere

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/DistrhoPluginVST2.cpp

@@ -36,6 +36,10 @@
 
 #include "xaymar-vst2/vst.h"
 
+START_NAMESPACE_DISTRHO
+
+// --------------------------------------------------------------------------------------------------------------------
+
 extern "C" {
 
 // define the midi stuff ourselves
@@ -85,8 +89,6 @@ typedef struct _VstTimeInfo {
 
 }
 
-START_NAMESPACE_DISTRHO
-
 // --------------------------------------------------------------------------------------------------------------------
 
 typedef std::map<const String, String> StringMap;