Add xxhash as a dependency

Summary:
X-link: facebookincubator/zstrong#1008

This doesn't seem to be a new dependency, but build errors only recently started surfacing for OSS:
https://www.internalfb.com/sandcastle/workflow/3098476543635661395

Reviewed By: robertroeser

Differential Revision: D64120664

fbshipit-source-id: 64d6fa130fa41bcbb9a40003b3b02eed38123641

build/fbcode_builder/CMake/FindXxhash.cmake

@@ -0,0 +1,40 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# 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
+#
+#     http://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.
+
+#
+# - Try to find Facebook xxhash library
+# This will define
+# Xxhash_FOUND
+# Xxhash_INCLUDE_DIR
+# Xxhash_LIBRARY
+#
+
+find_path(Xxhash_INCLUDE_DIR NAMES xxhash.h)
+
+find_library(Xxhash_LIBRARY_RELEASE NAMES xxhash)
+
+include(SelectLibraryConfigurations)
+SELECT_LIBRARY_CONFIGURATIONS(Xxhash)
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(
+    Xxhash DEFAULT_MSG
+    Xxhash_LIBRARY Xxhash_INCLUDE_DIR
+)
+
+if (Xxhash_FOUND)
+  message(STATUS "Found xxhash: ${Xxhash_LIBRARY}")
+endif()
+
+mark_as_advanced(Xxhash_INCLUDE_DIR Xxhash_LIBRARY)

build/fbcode_builder/manifests/fbthrift

@@ -26,6 +26,7 @@ libsodium
 wangle
 zstd
 mvfst
+xxhash
 # Thrift also depends on openssl but since the latter requires a platform-
 # specific configuration we rely on the folly manifest to provide this
 # dependency to avoid duplication.

build/fbcode_builder/manifests/xxhash

@@ -1,5 +1,20 @@
 [manifest]
 name = xxhash
 
+[download]
+url = https://github.com/Cyan4973/xxHash/archive/refs/tags/v0.8.2.tar.gz
+sha256 = baee0c6afd4f03165de7a4e67988d16f0f2b257b51d0e3cb91909302a26a79c4
+
 [rpms]
 xxhash-devel
+
+[build.not(os=windows)]
+builder = make
+subdir = xxHash-0.8.2
+
+[make.build_args]
+all
+
+[make.install_args]
+install
+