some follow-up for MSDOS build

The preprocessor directives in win/tty/wintty.c were crossed-up
under MSDOS build. I think I got them straightened out now.

For a crosscompile situation, the tilemap utility (which runs on
the host) needs to produce an output src/tile.c that is compatible
for the target platform.

Don't use ENHANCED_SYMBOLS under MSDOS, for now anyway.

include/config.h

@@ -661,6 +661,10 @@ typedef unsigned char uchar;
 # endif
 #endif
 
+#if defined(MSDOS) && defined(ENHANCED_SYMBOLS)
+#undef ENHANCED_SYMBOLS
+#endif
+
 #include "integer.h"
 #include "global.h" /* Define everything else according to choices above */