docs: Remove recorder.xml.in (#12395)

This file references another for inclusion that no longer exists. With
gtk-doc-tools 1.34.0, stricter checking is enabled that results in a failure
which halts the build process due to this invalid file reference.

Author: rcalixte

docs/reference/cinnamon/cinnamon-docs.sgml

@@ -35,7 +35,6 @@
     <xi:include href="xml/cinnamon-tray-icon.xml"/>
     <xi:include href="xml/cinnamon-tray-manager.xml"/>
   </chapter>
-  <xi:include href="recorder.xml"/>
   <chapter>
     <title>Integration helpers and utilities</title>
     <xi:include href="xml/cinnamon-global.xml"/>

docs/reference/cinnamon/meson.build

@@ -7,23 +7,10 @@ ignore = [
     sniffer_headers,
 ]
 
-recorder_conf = configuration_data()
-
-if get_option('build_recorder')
-    recorder_conf.set('BUILD_RECORDER_XML_START', '-->')
-    recorder_conf.set('BUILD_RECORDER_XML_END', '<!--')
-else
-    recorder_conf.set('BUILD_RECORDER_XML_START', '')
-    recorder_conf.set('BUILD_RECORDER_XML_END', '')
+if not get_option('build_recorder')
     ignore += 'cinnamon-recorder.h'
 endif
 
-configure_file(
-    input: 'recorder.xml.in',
-    output: 'recorder.xml',
-    configuration: recorder_conf,
-)
-
 gnome.gtkdoc(
     'cinnamon',
     mode: 'xml',