remove obsolete and unused gethostbyaddr implementation

this code was already under #if 0, but could be confusing if a reader
didn't notice that, and it's almost surely full of bugs and/or
inconsistencies with the current code that uses the gethostbyname2_r
backend.

src/network/gethostbyname.c

@@ -9,55 +9,3 @@ struct hostent *gethostbyname(const char *name)
 {
 	return gethostbyname2(name, AF_INET);
 }
-
-#if 0
-struct hostent *gethostbyname(const char *name)
-{
-	static struct hostent h;
-	static char *h_aliases[3];
-	static char h_canon[256];
-	static char *h_addr_list[10];
-	static char h_addr_data[10][4];
-	static const struct addrinfo hint = {
-		.ai_family = AF_INET, .ai_flags = AI_CANONNAME
-	};
-	struct addrinfo *ai, *p;
-	int i;
-
-	switch (getaddrinfo(name, 0, &hint, &ai)) {
-	case EAI_NONAME:
-		h_errno = HOST_NOT_FOUND;
-		break;
-	case EAI_AGAIN:
-		h_errno = TRY_AGAIN;
-		break;
-	case EAI_FAIL:
-		h_errno = NO_RECOVERY;
-		break;
-	default:
-	case EAI_MEMORY:
-	case EAI_SYSTEM:
-		h_errno = NO_DATA;
-		break;
-	case 0:
-		break;
-	}
-
-	strcpy(h_canon, ai->ai_canonname);
-	h.h_name = h_canon;
-	h.h_aliases = h_aliases;
-	h.h_aliases[0] = h_canon;
-	h.h_aliases[1] = strcmp(h_canon, name) ? (char *)name : 0;
-	h.h_length = 4;
-	h.h_addr_list = h_addr_list;
-	for (i=0, p=ai; i<sizeof h_addr_data/4 && p; i++, p=p->ai_next) {
-		h.h_addr_list[i] = h_addr_data[i];
-		memcpy(h.h_addr_list[i],
-			&((struct sockaddr_in *)p->ai_addr)->sin_addr, 4);
-	}
-	h.h_addr_list[i] = 0;
-	h.h_addrtype = AF_INET;
-	freeaddrinfo(ai);
-	return &h;
-}
-#endif