Revert "tdf#42949 Fix IWYU warnings in include/rtl/*"

This partilally reverts commit 55ca35ab99fb1164cb2095384ed0937a533d9d3c,
the removal of <utility> was not correct, std::move() still requires it.

Change-Id: I1f905e332874b0aa72f537e37251f822258577d6
Reviewed-on: https://gerrit.libreoffice.org/66033
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
diff --git a/include/rtl/string.hxx b/include/rtl/string.hxx
index b26aa23..c60cb8d 100644
--- a/include/rtl/string.hxx
+++ b/include/rtl/string.hxx
@@ -26,6 +26,7 @@
#include <cstddef>
#include <new>
#include <ostream>
#include <utility>
#include <string.h>

#if defined LIBO_INTERNAL_ONLY
diff --git a/include/rtl/ustring.hxx b/include/rtl/ustring.hxx
index bf63efc..c6e3760 100644
--- a/include/rtl/ustring.hxx
+++ b/include/rtl/ustring.hxx
@@ -26,6 +26,7 @@
#include <cstddef>
#include <new>
#include <ostream>
#include <utility>

#if defined LIBO_INTERNAL_ONLY
#include <string_view>