fish: conf.d/setup: Add rustup symlink path to PATH

See related
https://bugs.archlinux.org/task/78309?string=78309&project=5
aa625d449c
17eb57f5a8

We still need to keep this to use rust-analyzer via rustup. The other
option would be install the rust-analyzer package separately and not
use this via rustup.

fish/.config/fish/conf.d/setup.fish

@@ -5,6 +5,10 @@ function __fish_setup_on_tty_login --description "Set up environment on tty logi
         end
     end
 
+    if test -d /usr/lib/rustup/bin
+        set -gxp PATH /usr/lib/rustup/bin
+    end
+
     if test -d {$HOME}/.nix-defexpr/channels
         set -gx NIX_PATH {$HOME}/.nix-defexpr/channels
         set -gx NIX_SSL_CERT_FILE '/etc/ssl/certs/ca-certificates.crt'