This reverts commit 4e9833d9e8e7bb449ca897d1f7e9db48fbf8aa53, reversing changes made to 6194e9d801d31d6241deb5c6dc534975887f143d. Setting TERMINFO prevents ncurses from reading TERMINFO_DIRS. See https://github.com/NixOS/nixpkgs/pull/15384#issuecomment-221205596