Native linux VST support (#6048)

Co-authored-by: Dominic Clark <mrdomclark@gmail.com>

include/RemotePlugin.h

@@ -36,7 +36,6 @@
 #include <string>
 #include <cassert>
 
-
 #if !(defined(LMMS_HAVE_SYS_IPC_H) && defined(LMMS_HAVE_SEMAPHORE_H))
 #define SYNC_WITH_SHM_FIFO
 #define USE_QT_SEMAPHORES
@@ -440,6 +439,7 @@ enum RemoteMessageIDs
 	IdSavePresetFile,
 	IdLoadPresetFile,
 	IdDebugMessage,
+	IdIdle,
 	IdUserBase = 64
 } ;
 
@@ -1000,7 +1000,6 @@ private:
 
 	sample_rate_t m_sampleRate;
 	fpp_t m_bufferSize;
-
 } ;
 
 #endif

include/aeffectx.h

@@ -30,7 +30,11 @@
 #include <type_traits>
 
 // Calling convention
+#ifdef _WIN32
 #define VST_CALL_CONV __cdecl
+#else
+#define VST_CALL_CONV 
+#endif
 
 template<typename T>
 constexpr int32_t CCONST(T a, T b, T c, T d)