Now that there are two different NT ports,
distinguish between them for fixes entries.
tty: clear screen before version incompatibility message so it doesn't just
print the message overwriting previous screen text
unix/tty: give user a chance to see any error produced by (de)compression
-win32: menus can take advantage of consoles larger than 80x25
-win32: add support for inverse attribute
+win32/tty: menus can take advantage of consoles larger than 80x25
+win32/tty: add support for inverse attribute
micro: prevent a guaranteed impossible() if we ever have more than (COLNO - 1)
levels in the game
msdos: placeholder tiles accepted by the thin tile builder