Apparently, edf2541f02 was missed while
rebasing https://github.com/NixOS/nixpkgs/pull/93562.
Provide 50-user.conf in fontconfig if includeUserConf is true (the
default), and don't try removing the non-existent one if it's disabled
Fixes https://github.com/NixOS/nixpkgs/issues/95685
Fixes https://github.com/NixOS/nixpkgs/issues/95712
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