into a predefined buffer insted of using the static (global) buffer. This is useful if
the converted value will be used later on; no need to copy it somewhere else to save it.
-CodeChange: [win32] Added appropiate macros WIDE_TO_MB_BUFFER, MB_TO_WIDE_BUFFER next to
existing WIDE_TO_MB and MB_TO_WIDE that only do work when UNICODE is defined, saves
#ifdefs all over the place
