[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/valarray b/include/valarray
index b47807c..ff745d3 100644
--- a/include/valarray
+++ b/include/valarray
@@ -360,11 +360,6 @@
 #include <new>
 #include <version>
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <algorithm>
-#  include <functional>
-#endif
-
 // standard-mandated includes
 #include <initializer_list>
 
@@ -4932,4 +4927,9 @@
 
 _LIBCPP_POP_MACROS
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <algorithm>
+#  include <functional>
+#endif
+
 #endif // _LIBCPP_VALARRAY