bytevector<?, bytevector<=?, bytevector>? and bytevector>=? return wrong result

[Takashi Kato]

This should be #f

(bytevector<? #vu8(99 50) #vu8(99 37 52 48))

but return #t. All the procedures are analogy of string<? and others, so must be the same computation. e.g.

(string<? "c2" "c%40")

return #f

[Takashi Kato]

Fixing inconsistent comparison. Fixes #220

→ <<cset c20be9be8122>>