Don't install man page on Windows

man pages don't make sense on Windows

Change-Id: If351b6a4b2e938b6c909e221956bf884747124db

data/meson.build

 
-install_man('update-mime-database.1')
+if build_machine.system() != 'windows'
+    install_man('update-mime-database.1')
+endif
 
 freedesktop_org_xml = i18n.merge_file(
     input: 'freedesktop.org.xml.in',