[NFC][libc++] Moves transitive includes location.

As discussed in D132284 they will be moved to the end.

Reviewed By: #libc, Mordante

Differential Revision: https://reviews.llvm.org/D133212

NOKEYCHECK=True
GitOrigin-RevId: e31c2a1b1a643861f25ba0145cb4701c999fc6c2
diff --git a/include/numeric b/include/numeric
index ba030aa..64cd45b 100644
--- a/include/numeric
+++ b/include/numeric
@@ -163,11 +163,6 @@
 #include <__numeric/transform_inclusive_scan.h>
 #include <__numeric/transform_reduce.h>
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <functional>
-#  include <iterator>
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
@@ -176,4 +171,9 @@
 #   include <__pstl_numeric>
 #endif
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <functional>
+#  include <iterator>
+#endif
+
 #endif // _LIBCPP_NUMERIC