[libc++] Remove unnecessary LLVM_INCLUDE_BENCHMARKS option in the Apple build

Since we're using an empty top-level CMakeLists.txt instead of the CMakeLists.txt
inside llvm/, we don't need to specify LLVM_INCLUDE_BENCHMARKS anymore.

diff --git a/libcxx/utils/ci/apple-install-libcxx.sh b/libcxx/utils/ci/apple-install-libcxx.sh
index ae20bf3..7c3517d 100755 (executable)
--- a/libcxx/utils/ci/apple-install-libcxx.sh
+++ b/libcxx/utils/ci/apple-install-libcxx.sh
@@ -118,7 +118,6 @@ for arch in ${architectures}; do
             -GNinja \
             -DCMAKE_MAKE_PROGRAM="$(xcrun --sdk "${sdk}" --find ninja)" \
             -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
-            -DLLVM_INCLUDE_BENCHMARKS=OFF \
             -C "${cache}" \
             -DCMAKE_INSTALL_PREFIX="${build_dir}/${arch}-install" \
             -DCMAKE_INSTALL_NAME_DIR="${install_name_dir}" \