refuse to build when a greasing TP is used

Author: kazuho

lib/quicly.c

@@ -1656,6 +1656,7 @@ int quicly_encode_transport_parameter_list(ptls_buffer_t *buf, const quicly_tran
 
 #define PUSH_TP(buf, id, block)                                                                                                    \
     do {                                                                                                                           \
+        PTLS_BUILD_ASSERT(((uint64_t)id - 27) % 31 != 0);                                                                          \
         ptls_buffer_push_quicint((buf), (id));                                                                                     \
         ptls_buffer_push_block((buf), -1, block);                                                                                  \
     } while (0)