Drop elements with its namespace from fonts.conf.in

This appears to have been forgotten in fontconfig/fontconfig!97
3 jobs for patch-1 in 9 minutes and 16 seconds
Status Job ID Name Coverage
  Build
passed mingw-build #3260314

00:09:14

passed shared-build #3260312

00:07:24

passed static-build #3260313

00:03:48