p11-kit: add Fedora/RHEL trust store path
p11-kit: add Fedora/RHEL trust store path

Fedora and RHEL use a different location for the trust store, compared
to other distros. Without this, validation of the CA root certificates
fails in all nss applications.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs