tsm-client: use `libxcrypt-legacy` to fix build

Since commit 4e300e071b97e1e3a6ba4d856cc65e5386366f6f
building `tsm-client` fails with error messages

> error: auto-patchelf could not satisfy dependency libcrypt.so.1 wanted by [...]

Luckily, commit 9b766dd41b9b49cb0c1b1f3317fc2273f1f8f3a0
introduces `libxcrypt-legacy` which again provides `libcrypt.so.1`.

pkgs/tools/backup/tsm-client/default.nix

···
 , fetchurl
 , autoPatchelfHook
 , rpmextract
-, libxcrypt
+, libxcrypt-legacy
 , openssl
 , zlib
 , lvm2  # LVM image backup and restore functions (optional)
···
       rpmextract
     ];
     buildInputs = [
-      libxcrypt
+      libxcrypt-legacy
       openssl
       stdenv.cc.cc
       zlib