build with Meson instead of autotools

So long, autotools!  This is my last MPD related project to migrate
away from it.  It has its strengths, but also very obvious weaknesses
and weirdnesses.  Today, many of its quirks are not needed anymore,
and are cumbersome and slow.  Now welcome our new Meson overlords!

src/lib/upnp/meson.build

@@ -0,0 +1,40 @@
+upnp_dep = dependency('libupnp', required: get_option('upnp'))
+conf.set('ENABLE_UPNP', upnp_dep.found())
+if not upnp_dep.found()
+  subdir_done()
+endif
+
+if not curl_dep.found()
+  error('UPnP requires CURL')
+endif
+
+if not expat_dep.found()
+  error('UPnP requires expat')
+endif
+
+upnp = static_library(
+  'upnp',
+  'Init.cxx',
+  'ClientInit.cxx',
+  'Device.cxx',
+  'ContentDirectoryService.cxx',
+  'Discovery.cxx',
+  'ixmlwrap.cxx',
+  'Util.cxx',
+  include_directories: inc,
+  dependencies: [
+    upnp_dep,
+    curl_dep,
+    expat_dep,
+  ],
+)
+
+upnp_dep = declare_dependency(
+  link_with: upnp,
+  dependencies: [
+    upnp_dep,
+    curl_dep,
+    expat_dep,
+    event_dep,
+  ],
+)