[libc++] Granularize <concept> includes
Reviewed By: ldionne, #libc
Spies: libcxx-commits
Differential Revision: https://reviews.llvm.org/D137283
NOKEYCHECK=True
GitOrigin-RevId: 89b356f05ab7aa3d96fc7b68aece6e7a5bdb0db5
diff --git a/include/valarray b/include/valarray
index f28e471..6c33d05 100644
--- a/include/valarray
+++ b/include/valarray
@@ -4931,6 +4931,7 @@
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <algorithm>
+# include <concepts>
# include <functional>
#endif