sbcl: restore disabled test (#457813)

pkgs/development/compilers/sbcl/default.nix

@@ -158,22 +158,6 @@ stdenv.mkDerivation (finalAttrs: {
       "threads.pure.lisp"
     ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
-      # This test has a gotcha on Darwin which originally showed up in
-      # 57b36ea5c83a1841b174ec6cd5e423439fe9d7a0, and later again around Oct
-      # 2025 in staging.  The test wants a clean environment (using
-      # run-program, akin to fork & execve), but darwin keeps injecting this
-      # envvar:
-      #
-      #   __CF_USER_TEXT_ENCODING=0x15F:0:0
-      #
-      # It’s not clear to maintainers where the problem lies exactly, but
-      # removing the test at least fixes the build and unblocks others.
-      #
-      # see:
-      # - https://github.com/NixOS/nixpkgs/pull/359214
-      # - https://github.com/NixOS/nixpkgs/pull/453099
-      "run-program.test.sh"
-
       # Fails in sandbox
       "sb-posix.impure.lisp"
     ];