remove unused script

nix/fake-rustup.sh

@@ -1,35 +0,0 @@
-#!/usr/bin/env bash
-# Fake rustup for nix-managed Rust toolchains
-
-case "$1" in
-  run)
-    if [[ "$2" == "stable" ]]; then
-      shift 2
-      if [[ $# -eq 0 ]]; then
-        echo "fake rustup: no command given" >&2
-        exit 1
-      fi
-      exec "$@"
-      exit 0
-    fi
-    ;;
-
-  toolchain)
-    if [[ "$2" == "list" ]]; then
-      echo "stable (default)"
-      exit 0
-    fi
-    ;;
-    
-  target)
-    if [[ "$2" == "list" && "$3" == "--toolchain" && "$4" == "stable" && "$5" == "--installed" ]]; then
-      echo "x86_64-unknown-linux-gnu"
-      exit 0
-    fi
-    ;;
-esac
-
-echo "fake rustup: the command:" >&2
-echo "  rustup $*" >&2
-echo "…is not mocked yet" >&2
-exit 1