[gn build] Port d2a46e6

Author: llvmgnsyncbot

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

@@ -168,6 +168,7 @@ if (current_toolchain == default_toolchain) {
       "__algorithm/pstl_generate.h",
       "__algorithm/pstl_is_partitioned.h",
       "__algorithm/pstl_merge.h",
+      "__algorithm/pstl_move.h",
       "__algorithm/pstl_replace.h",
       "__algorithm/pstl_sort.h",
       "__algorithm/pstl_stable_sort.h",