Checking iBufferLeft > iBufferUsed does not make sense, since
this would stop writing into the buffer alredy after the buffer
is half full, when there is less space left than has been used.
The right check is iBufferLeft > 0.
No code exists within the project for building such a trace library.
This also fixes building on OS X with -Wno-deprecated-declarations
removed, since this code contained calls to deprecated functions
within #ifdef MACOS, which now are enabled when building on OS X.
Add a struct that matches the C++ interface vtable.
This requires that the C++ interface methods are declared to use
the same calling convention as normal C functions, and that the
C struct exactly matches the layout and ordering of the C++
virtual table - MSVC seemed to reorder methods if there were
overloaded methods.
This is required to make the order in the C++ virtual table
consistent in MSVC - previously the overloaded methods were
ordered differently in the vtable compared to the interface
declaration.
The same ifdefs are already used in the corresponding constructors,
so this just avoids a runtime/link time library dependency which
is practically unused in this build setup.
