dedup zstd configuration flags

Author: keith

utils/bazel/third_party_build/zstd.BUILD

@@ -1,7 +1,6 @@
 # This file is licensed under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-load("@bazel_skylib//rules:common_settings.bzl", "bool_flag")
 load("@rules_cc//cc:cc_library.bzl", "cc_library")
 
 package(
@@ -10,20 +9,10 @@ package(
     licenses = ["notice"],
 )
 
-bool_flag(
-    name = "llvm_enable_zstd",
-    build_setting_default = True,
-)
-
-config_setting(
-    name = "llvm_zstd_enabled",
-    flag_values = {":llvm_enable_zstd": "true"},
-)
-
 cc_library(
     name = "zstd",
     srcs = select({
-        ":llvm_zstd_enabled": glob([
+        "@llvm-project//third-party:llvm_zstd_enabled": glob([
             "lib/common/*.c",
             "lib/common/*.h",
             "lib/compress/*.c",
@@ -37,15 +26,15 @@ cc_library(
         "//conditions:default": [],
     }),
     hdrs = select({
-        ":llvm_zstd_enabled": [
+        "@llvm-project//third-party:llvm_zstd_enabled": [
             "lib/zdict.h",
             "lib/zstd.h",
             "lib/zstd_errors.h",
         ],
         "//conditions:default": [],
     }),
     defines = select({
-        ":llvm_zstd_enabled": [
+        "@llvm-project//third-party:llvm_zstd_enabled": [
             "LLVM_ENABLE_ZSTD=1",
             "ZSTD_MULTITHREAD",
         ],