D4D_UNICODE: Not compilable under CW

[elnicoCZ]

The D4D_UNICODE feature cannot be enabled if project compiled with CW, as the default wchar_t size in prebuilt CW standard libraries is 4 bytes, disallowing e.g. the following initialization in d4d_string.c:

D4D_TCHAR str_touch[10] = D4D_DEFSTR("X1:00000");

More information can be found in the discussion https://community.freescale.com/message/444007#444007 .