Fix broken bazel build.

The file was not found by the core library. Fix originally provided by @behamilton.

In file included from quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.cc:5:
bazel-out/k8-fastbuild/bin/quiche/_virtual_includes/quiche_platform_default/quiche_platform_impl/quiche_flags_impl.h:29:10: fatal error: quiche/common/quiche_protocol_flags_list.h: No such file or directory
   29 | #include "quiche/common/quiche_protocol_flags_list.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PiperOrigin-RevId: 471672863
diff --git a/quiche/BUILD.bazel b/quiche/BUILD.bazel
index e339ecd..fd35ab8 100644
--- a/quiche/BUILD.bazel
+++ b/quiche/BUILD.bazel
@@ -31,6 +31,13 @@
 )
 
 cc_library(
+    name = "quiche_flags_list",
+    textual_hdrs = [
+        "common/quiche_protocol_flags_list.h",
+    ],
+)
+
+cc_library(
     name = "quic_flags_list",
     textual_hdrs = [
         "quic/core/quic_flags_list.h",
@@ -62,6 +69,7 @@
     strip_include_prefix = "common/platform/default",
     deps = [
         ":quic_flags_list",
+        ":quiche_flags_list",
         ":quiche_platform_quiche_export",
         "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/container:flat_hash_map",