util/AllocatedString, ...: add missing include for std::exchange()

NEWS

 ver 0.23.5 (not yet released)
+* GCC 12 build fixes
 
 ver 0.23.4 (2021/11/11)
 * protocol

src/input/InputStream.hxx

@@ -27,6 +27,7 @@
 #include <cassert>
 #include <memory>
 #include <string>
+#include <utility>
 
 struct Tag;
 class InputStreamHandler;

src/lib/curl/Slist.hxx

@@ -32,8 +32,8 @@
 
 #include <curl/curl.h>
 
-#include <algorithm>
 #include <stdexcept>
+#include <utility>
 
 /**
  * OO wrapper for "struct curl_slist *".

src/lib/yajl/Handle.hxx

@@ -32,7 +32,7 @@
 
 #include <yajl/yajl_parse.h>
 
-#include <algorithm>
+#include <utility>
 
 namespace Yajl {
 

src/util/AllocatedArray.hxx

@@ -35,6 +35,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <utility>
 
 /**
  * An array allocated on the heap with a length determined at runtime.

src/util/AllocatedString.hxx

@@ -35,6 +35,7 @@
 #include <algorithm>
 #include <cstddef>
 #include <string_view>
+#include <utility>
 
 /**
  * A string pointer whose memory is managed by this class.