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.

win/share/tilemap.c

@@ -54,6 +54,10 @@ extern void exit(int);
 #endif
 #endif
 
+#if defined(CROSSCOMPILE) && defined(ENHANCED_SYMBOLS)
+#undef ENHANCED_SYMBOLS
+#endif
+
 struct {
     int idx;
     const char *tilelabel;