'libs/evoral' - DLL visibility stuff and associated changes needed for building with MSVC. Currently includes debugging information and things that are just commented out until we have known compatibility with the other platforms (i.e. contains stuff to be removed at a later date)

libs/evoral/src/SMF.cpp

@@ -27,6 +27,10 @@
 #include "evoral/midi_util.h"
 #include "pbd/file_manager.h"
 
+#ifdef COMPILER_MSVC
+extern double round(double x);
+#endif
+
 using namespace std;
 
 namespace Evoral {