[libc++/abi] Clean up uses of <iostream> in the test suite
We used <iostream> in several places where we don't actually need the
full power of <iostream>, and where using basic `std::printf` is enough.
This is better, since `std::printf` can be supported on systems that don't
have a notion of locales, while <iostream> can't.
diff --git a/libcxx/test/std/namespace/addressable_functions.sh.cpp b/libcxx/test/std/namespace/addressable_functions.sh.cpp
index 3d5fe11..9b5e80e 100644
--- a/libcxx/test/std/namespace/addressable_functions.sh.cpp
+++ b/libcxx/test/std/namespace/addressable_functions.sh.cpp
@@ -18,8 +18,10 @@
// RUN: %{exec} %t.exe
#include <cassert>
-#include <iostream>
+#include <ios>
+#include <istream>
#include <map>
+#include <ostream>
#include <string>
#include <utility>
