[libc++] Add missing include in __format/unicode.h

diff --git a/libcxx/include/__format/unicode.h b/libcxx/include/__format/unicode.h
index fdcaff8..4327258 100644 (file)
--- a/libcxx/include/__format/unicode.h
+++ b/libcxx/include/__format/unicode.h
@@ -13,6 +13,7 @@
 #include <__assert>
 #include <__config>
 #include <__format/extended_grapheme_cluster_table.h>
+#include <__type_traits/make_unsigned.h>
 #include <__utility/unreachable.h>
 #include <bit>