db/upnp: un-inline a few destructors

Reduce bloat.

Makefile.am

@@ -429,7 +429,7 @@ libdb_plugins_a_SOURCES += \
 	src/db/upnp/Util.cxx src/db/upnp/Util.hxx \
 	src/db/upnp/Action.hxx \
 	src/db/upnp/WorkQueue.hxx \
-	src/db/upnp/Object.hxx
+	src/db/upnp/Object.cxx src/db/upnp/Object.hxx
 DB_LIBS += \
 	$(EXPAT_LIBS) \
 	$(UPNP_LIBS)

src/db/upnp/ContentDirectoryService.cxx

@@ -48,6 +48,11 @@ ContentDirectoryService::ContentDirectoryService(const UPnPDevice &device,
 	}
 }
 
+ContentDirectoryService::~ContentDirectoryService()
+{
+	/* this destructor exists here just so it won't get inlined */
+}
+
 static bool
 ReadResultTag(UPnPDirContent &dirbuf, IXML_Document *response, Error &error)
 {

src/db/upnp/ContentDirectoryService.hxx

@@ -68,6 +68,8 @@ public:
 	/** An empty one */
 	ContentDirectoryService() = default;
 
+	~ContentDirectoryService();
+
 	/** Read a container's children list into dirbuf.
 	 *
 	 * @param objectId the UPnP object Id for the container. Root has Id "0"

src/db/upnp/Device.cxx

@@ -27,6 +27,11 @@
 
 #include <string.h>
 
+UPnPDevice::~UPnPDevice()
+{
+	/* this destructor exists here just so it won't get inlined */
+}
+
 /**
  * An XML parser which constructs an UPnP device object from the
  * device descriptor.

src/db/upnp/Device.hxx

@@ -75,6 +75,8 @@ public:
 	UPnPDevice(UPnPDevice &&) = default;
 	UPnPDevice &operator=(UPnPDevice &&) = default;
 
+	~UPnPDevice();
+
 	/** Build device from xml description downloaded from discovery
 	 * @param url where the description came from
 	 * @param description the xml device description

src/db/upnp/Directory.cxx

@@ -31,6 +31,11 @@
 
 #include <string.h>
 
+UPnPDirContent::~UPnPDirContent()
+{
+	/* this destructor exists here just so it won't get inlined */
+}
+
 gcc_pure gcc_nonnull_all
 static bool
 CompareStringLiteral(const char *literal, const char *value, size_t length)

src/db/upnp/Directory.hxx

@@ -36,6 +36,8 @@ class UPnPDirContent {
 public:
 	std::vector<UPnPDirObject> objects;
 
+	~UPnPDirContent();
+
 	gcc_pure
 	UPnPDirObject *FindObject(const char *name) {
 		for (auto &o : objects)

src/db/upnp/Object.cxx

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "Object.hxx"
+
+UPnPDirObject::~UPnPDirObject()
+{
+	/* this destructor exists here just so it won't get inlined */
+}

src/db/upnp/Object.hxx

@@ -66,6 +66,9 @@ public:
 
 	UPnPDirObject() = default;
 	UPnPDirObject(UPnPDirObject &&) = default;
+
+	~UPnPDirObject();
+
 	UPnPDirObject &operator=(UPnPDirObject &&) = default;
 
 	void clear()