build: Include sprites in freedoom1.wad for compatibility.
build: Include sprites in freedoom1.wad for compatibility.

The following unused sprites appeared in doom.wad: APBX, APLS, BOSF,
MANF. These are Doom 2 sprites. Although unused, they can be (and are)
used in mods. Include these in freedoom1.wad for compatibility.
This fixes #36.

jmtd/freedoom,jmtd/freedoom,CWolfRU/freedoom,jmtd/freedoom,CWolfRU/freedoom