Remove -DUNORDERED_SET_CXX17 since the macro no longer exists

PiperOrigin-RevId: 846785448
Change-Id: Ic21788f29f6c42382d49a64246eebf92964af6e4

absl/container/BUILD.bazel

diff --git a/absl/container/BUILD.bazel b/absl/container/BUILD.bazel
index 411df0e..f24bad7 100644
--- a/absl/container/BUILD.bazel
+++ b/absl/container/BUILD.bazel
@@ -308,7 +308,7 @@
 cc_test(
     name = "flat_hash_set_test",
     srcs = ["flat_hash_set_test.cc"],
-    copts = ABSL_TEST_COPTS + ["-DUNORDERED_SET_CXX17"],
+    copts = ABSL_TEST_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     tags = ["no_test_loonix"],
     deps = [
@@ -388,7 +388,7 @@
 cc_test(
     name = "node_hash_set_test",
     srcs = ["node_hash_set_test.cc"],
-    copts = ABSL_TEST_COPTS + ["-DUNORDERED_SET_CXX17"],
+    copts = ABSL_TEST_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     tags = ["no_test_loonix"],
     deps = [

absl/container/CMakeLists.txt

diff --git a/absl/container/CMakeLists.txt b/absl/container/CMakeLists.txt
index 40b8b07..f1ea9e2 100644
--- a/absl/container/CMakeLists.txt
+++ b/absl/container/CMakeLists.txt
@@ -349,7 +349,6 @@
     "flat_hash_set_test.cc"
   COPTS
     ${ABSL_TEST_COPTS}
-    "-DUNORDERED_SET_CXX17"
   DEPS
     absl::check
     absl::config
@@ -432,7 +431,6 @@
     "node_hash_set_test.cc"
   COPTS
     ${ABSL_TEST_COPTS}
-    "-DUNORDERED_SET_CXX17"
   DEPS
     absl::hash_generator_testing
     absl::hash_policy_testing