LibCore: Move AddressInfoVector to its own file

By defining this class entirely in the System.h header, we are relying
on ::freeaddrinfo being available. This has led to us polluting the
System.h header with system-level definitions on Windows by way of
SocketAddressWindows.h.

Libraries/LibCore/AddressInfoVector.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.fr>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/AddressInfoVector.h>
+
+#if defined(AK_OS_WINDOWS)
+#    include <ws2tcpip.h>
+#else
+#    include <netdb.h>
+#    include <sys/socket.h>
+#    include <sys/types.h>
+#endif
+
+namespace Core::System {
+
+AddressInfoVector::AddressInfoVector(Vector<struct addrinfo> addresses, struct addrinfo* ptr)
+    : m_addresses(move(addresses))
+    , m_ptr(adopt_own_if_nonnull(ptr))
+{
+}
+
+AddressInfoVector::~AddressInfoVector() = default;
+
+void AddressInfoVector::AddrInfoDeleter::operator()(struct addrinfo* ptr)
+{
+    if (ptr)
+        ::freeaddrinfo(ptr);
+}
+
+}

Libraries/LibCore/AddressInfoVector.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.fr>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/OwnPtr.h>
+#include <AK/Vector.h>
+
+struct addrinfo;
+
+namespace Core::System {
+
+class AddressInfoVector {
+    AK_MAKE_NONCOPYABLE(AddressInfoVector);
+    AK_MAKE_DEFAULT_MOVABLE(AddressInfoVector);
+
+public:
+    AddressInfoVector(Vector<struct addrinfo> addresses, struct addrinfo* ptr);
+    ~AddressInfoVector();
+
+    ReadonlySpan<struct addrinfo> addresses() const { return m_addresses; }
+
+private:
+    struct AddrInfoDeleter {
+        void operator()(struct addrinfo*);
+    };
+
+    Vector<struct addrinfo> m_addresses;
+    OwnPtr<struct addrinfo, AddrInfoDeleter> m_ptr;
+};
+
+}

Libraries/LibCore/CMakeLists.txt

@@ -1,6 +1,7 @@
 # These are the minimal set of sources needed to build the code generators. We separate them to allow
 # LibCore to depend on generated sources.
 set(SOURCES
+    AddressInfoVector.cpp
     ArgsParser.cpp
     Directory.cpp
     DirectoryEntry.cpp

Libraries/LibCore/System.h

@@ -13,6 +13,7 @@
 #include <AK/OwnPtr.h>
 #include <AK/StringView.h>
 #include <AK/Vector.h>
+#include <LibCore/AddressInfoVector.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <sys/stat.h>
@@ -141,36 +142,6 @@ ErrorOr<WaitPidResult> waitpid(pid_t waitee, int options = 0);
 ErrorOr<void> fchown(int fd, uid_t, gid_t);
 #endif
 
-class AddressInfoVector {
-    AK_MAKE_NONCOPYABLE(AddressInfoVector);
-    AK_MAKE_DEFAULT_MOVABLE(AddressInfoVector);
-
-public:
-    ~AddressInfoVector() = default;
-
-    ReadonlySpan<struct addrinfo> addresses() const { return m_addresses; }
-
-private:
-    friend ErrorOr<AddressInfoVector> getaddrinfo(char const* nodename, char const* servname, struct addrinfo const& hints);
-
-    AddressInfoVector(Vector<struct addrinfo>&& addresses, struct addrinfo* ptr)
-        : m_addresses(move(addresses))
-        , m_ptr(adopt_own_if_nonnull(ptr))
-    {
-    }
-
-    struct AddrInfoDeleter {
-        void operator()(struct addrinfo* ptr)
-        {
-            if (ptr)
-                ::freeaddrinfo(ptr);
-        }
-    };
-
-    Vector<struct addrinfo> m_addresses {};
-    OwnPtr<struct addrinfo, AddrInfoDeleter> m_ptr {};
-};
-
 ErrorOr<AddressInfoVector> getaddrinfo(char const* nodename, char const* servname, struct addrinfo const& hints);
 
 unsigned hardware_concurrency();