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 #3260314
mingw-build

00:09:14

passed #3260312
shared-build

00:07:24

passed #3260313
static-build

00:03:48