[libc++] Add missing include in test (#84579)

ldionne · web-flow · commit 02e0b7d405c3 · 2024-03-11T09:51:59.000-04:00
That test is using std::toupper.
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
@@ -29,6 +29,7 @@
 #include <algorithm>
 #include <array>
 #include <cassert>
+#include <cctype>
 #include <cmath>
 #include <charconv>
 #include <concepts>
