Fix a whole pile of issues related to the failed attempt to increase

the number of types of relocation possible in the object file. (Now,
hopefully, working.)

Also change the object serialiser/deserialiser to never try to read or
write raw structures; it's way safer this way and we don't need the
performance boost any more.

--HG--
branch : default-branch

mach/proto/as/comm6.c

@@ -281,8 +281,8 @@ newrelo(s, n)
 		return;
 	}
 	s &= ~S_VAR;
-	outrelo.or_type = (char)n;
-	outrelo.or_sect = (char)DOTTYP;
+	outrelo.or_type = n;
+	outrelo.or_sect = DOTTYP;
 #ifndef ASLD
 	if (s == S_UND || iscomm) {
 		assert(relonami != 0);