OWLNext 6.21.2 changes:

Removed is the support for outdated platforms and compilers

- removed are the defines and corresponding platform-dependent code for the platforms
BI_PLAT_OS2
BI_PLAT_DOS
BI_PLAT_WIN16
BI_PLAT_WIN32S
WIN32S_SUPPORT

- removed are the defines and corresponding platform-dependent code for the 16-bit memory models
BI_MODEL_TINY       DOS/Windows tiny model
BI_MODEL_SMALL      DOS/Windows small model
BI_MODEL_COMPACT    DOS/Windows compact model
BI_MODEL_MEDIUM     DOS/Windows medium model
BI_MODEL_LARGE      DOS/Windows large model
BI_MODEL_HUGE       DOS/Windows huge model
BI_DEFINE_HUGE

BI_DATA_NEAR        16-bit pointer in 16:16 models
BI_DATA_FAR         32-bit pointer in 16:16 models
BI_DATA_HUGE        32-bit huge pointer in 16:16 models

BI_CODE_NEAR        16-bit pointer in 16:16 models
BI_CODE_FAR         32-bit pointer in 16:16 models

- removed are the defines and corresponding code for the older non-standard comforming Borland C++ Compilers
BI_NO_MUTABLE				
BI_NO_NEW_CASTS

- removed are leftover "far" and "huge" keywords