Potential part for deletion

[Godzil]

Things that probably can be removed as not useful for a dedicated WonderSwan compiler:

• ar: do we need the provided AR? Intel OBJ/LIB would probably be better
• libc, libbsd: the use of the libc doubtful at best for the targeted environment, and the few potentially useful functions would need to be rewritten anyway. Having some ready made lib is a different subject.
• dis88: Do we need that disassembler? There are plenty existing
• as: Still have to look how BCC works internally, but I would prefer to use amore standard assembler like nasm.
• unproto if we update bcc to properly support C89/C99 construction
• as with libc/libbsd the include folder is probably useless.