[build] -Wno-implicit-fallthrough for ls-hpack
Wno-implicit-fallthrough for ls-hpack on cygwin using recent gcc
@@ -684,6 +684,7 @@ lshpack_enc_enc_int (unsigned char *dst, unsigned char *const end,
*/
#if __GNUC__
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
#if __clang__
#pragma GCC diagnostic ignored "-Wunknown-warning-option"
#endif
