Add 'third_party/abseil_cpp/' from commit '768eb2ca28'

git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54be
git-subtree-split: 768eb2ca28

third_party/abseil_cpp/ci/absl_alternate_options.h

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+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Alternate options.h file, used in continuous integration testing to exercise
+// option settings not used by default.
+
+#ifndef ABSL_BASE_OPTIONS_H_
+#define ABSL_BASE_OPTIONS_H_
+
+#define ABSL_OPTION_USE_STD_ANY 0
+#define ABSL_OPTION_USE_STD_OPTIONAL 0
+#define ABSL_OPTION_USE_STD_STRING_VIEW 0
+#define ABSL_OPTION_USE_STD_VARIANT 0
+#define ABSL_OPTION_USE_INLINE_NAMESPACE 1
+#define ABSL_OPTION_INLINE_NAMESPACE_NAME ns
+#define ABSL_OPTION_HARDENED 1
+
+#endif  // ABSL_BASE_OPTIONS_H_