Fix genproto.bzl test broken by unknown commit

Removed load() for defs.bzl from genproto.bzl. I can add this back at a later
CL. This will require adding more copybara rules to rules_cc.

RELNOTES:none
PiperOrigin-RevId: 258362338
diff --git a/tools/build_rules/genproto.bzl b/tools/build_rules/genproto.bzl
index d3dec1f..db55fac 100644
--- a/tools/build_rules/genproto.bzl
+++ b/tools/build_rules/genproto.bzl
@@ -16,8 +16,6 @@
 This is a quick and dirty rule to make Bazel compile itself. Do not use.
 """
 
-load("@rules_cc//cc:defs.bzl", "cc_library")
-
 proto_filetype = [".proto"]
 
 def cc_grpc_library(name, src):
@@ -47,7 +45,7 @@
         outs = [basename + ".grpc.pb.h", basename + ".grpc.pb.cc", basename + ".pb.cc", basename + ".pb.h"],
     )
 
-    cc_library(
+    native.cc_library(
         name = name,
         srcs = [basename + ".grpc.pb.cc", basename + ".pb.cc"],
         hdrs = [basename + ".grpc.pb.h", basename + ".pb.h"],