fix: add missing load() statements for Bazel 9 compatibility

[00fish0]

Problem

Bazel 9.0.0 removed the built-in cc_binary, cc_test, and cc_library rules. They must now be explicitly loaded from @rules_cc//cc:defs.bzl via a load() statement. This causes the CI build to fail with:

Error in fail:
         This rule has been removed from Bazel. Please add a \`load()\` statement for it.

Warnings:

In file included from include/ylt/coro_rpc/impl/coro_connection.hpp:40,
                 from include/ylt/coro_rpc/impl/coro_rpc_server.hpp:44,
                 from include/ylt/coro_rpc/coro_rpc_server.hpp:17,
                 from src/coro_rpc/examples/file_transfer/file_server.cpp:2:
include/ylt/coro_rpc/impl/errno.h: In member function ‘uint16_t& coro_rpc::rpc_error::val()’:
include/ylt/coro_rpc/impl/errno.h:114:29: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  114 |   uint16_t& val() { return *(uint16_t*)&(code.ec); }
      |                             ^~~~~~~~~~~~~~~~~~~~~
include/ylt/coro_rpc/impl/errno.h: In member function ‘const uint16_t& coro_rpc::rpc_error::val() const’:
include/ylt/coro_rpc/impl/errno.h:115:41: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  115 |   const uint16_t& val() const { return *(uint16_t*)&(code.ec); }
      |                                         ^~~~~~~~~~~~~~~~~~~~~
In file included from include/ylt/coro_rpc/coro_rpc_server.hpp:17,
                 from src/coro_rpc/examples/file_transfer/file_server.cpp:2:
include/ylt/coro_rpc/impl/coro_rpc_server.hpp: In instantiation of ‘async_simple::Future<coro_rpc::err_code> coro_rpc::coro_rpc_server_base<server_config>::async_start() [with server_config = coro_rpc::config_t]’:
include/ylt/coro_rpc/impl/coro_rpc_server.hpp:177:12:   required from ‘coro_rpc::err_code coro_rpc::coro_rpc_server_base<server_config>::start() [with server_config = coro_rpc::config_t]’
src/coro_rpc/examples/file_transfer/file_server.cpp:14:43:   required from here
include/ylt/coro_rpc/impl/coro_rpc_server.hpp:267:30: error: moving a local object in a return statement prevents copy elision [-Werror=pessimizing-move]
  267 |       return std::move(future);
      |                              ^
include/ylt/coro_rpc/impl/coro_rpc_server.hpp:267:30: note: remove ‘std::move’ call
cc1plus: all warnings being treated as errors
INFO: Elapsed time: 63.387s, Critical Path: 24.35s
INFO: 54 processes: 43 internal, 11 linux-sandbox.
ERROR: Build did NOT complete successfully
Error: Process completed with exit code 1.

Changes

• BUILD.bazel: Added missing "cc_test" to the existing load() statement (was only loading cc_binary and cc_library).
• src/coro_rpc/examples/file_transfer/BUILD.bazel: Added load("@rules_cc//cc:defs.bzl", "cc_binary") — was completely missing.
• src/struct_json/examples/BUILD.bazel: Added load("@rules_cc//cc:defs.bzl", "cc_binary") — was completely missing.

Verification

Local bazel build //... with Bazel 9.0.0 confirms all packages load successfully after this fix.

[Copilot]

Pull request overview

Adds explicit load() statements for rules_cc C++ rules to keep the build working under Bazel 9, where cc_* rules are no longer built-ins.

Changes:

• Load cc_test from @rules_cc//cc:defs.bzl in the root BUILD.bazel.
• Add missing cc_binary loads to example BUILD.bazel files that define cc_binary targets.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
BUILD.bazel	Loads cc_test from rules_cc to avoid Bazel 9 removed-builtin rule errors.
src/coro_rpc/examples/file_transfer/BUILD.bazel	Adds missing cc_binary load for Bazel 9 compatibility.
src/struct_json/examples/BUILD.bazel	Adds missing cc_binary load for Bazel 9 compatibility.

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[github-actions]

for detail, goto summary download Artifacts base-ylt-cov-report(base commit coverage report) and ylt-cov-report(current pull request coverage report)

[github-actions]

for detail, goto summary download Artifacts base-ylt-cov-report(base commit coverage report) and ylt-cov-report(current pull request coverage report)