ENHANCED_SYMBOLS is defined by default in config.h.
The msdos build tried to #undef ENHANCED_SYMBOLS
in tilemap.c, but doing it in there created a mismatch
between the data struct definition for glyph_map in wintype.h
and the initializers generated in tilemap.c
Move the msdos build catch for ENHANCED_SYMBOLS to
one single place in config1.h so that the code and data agree.
2965ce4bc5