Use tor_ntohs in compress.c; avoid a winsocks dependency

src/lib/compress/compress.c

@@ -281,7 +281,7 @@ detect_compression_method(const char *in, size_t in_len)
   if (in_len > 2 && fast_memeq(in, "\x1f\x8b", 2)) {
     return GZIP_METHOD;
   } else if (in_len > 2 && (in[0] & 0x0f) == 8 &&
-             (ntohs(get_uint16(in)) % 31) == 0) {
+             (tor_ntohs(get_uint16(in)) % 31) == 0) {
     return ZLIB_METHOD;
   } else if (in_len > 2 &&
              fast_memeq(in, "\x5d\x00\x00", 3)) {