Add MxTrace function (#1054)

LEGO1/omni/include/mxdebug.h

@@ -0,0 +1,32 @@
+#ifndef MXDEBUG_H
+#define MXDEBUG_H
+
+#include "compat.h"
+
+#ifdef _DEBUG
+
+// In debug mode, replace the macro with the function call.
+#define MxTrace _MxTrace
+
+void _MxTrace(const char* format, ...);
+int DebugHeapState();
+
+#else
+
+// If not debug, MxTrace is a no-op.
+
+#ifdef COMPAT_MODE
+
+// Use variadic args for macro (C99)
+#define MxTrace(...)
+
+#else
+
+// MSVC 4.20 does not have variadic args for macros
+#define MxTrace(args)
+
+#endif // COMPAT_MODE
+
+#endif // _DEBUG
+
+#endif // MXDEBUG_H