GH-320 Reorder potential library paths for macOS Monterey compatibility.

Running 'perl Makefile.PL' may fail with:
   WARNING: .../perl is loading libcrypto in an unsafe way

See #329
and https://openradar.appspot.com/FB9725981 (linked by GH-329) for
more information.

To summarise why this commit helps in this case:

  The failure is triggered when the prospective library directory exists but
  does not contain the desired library file. That is, $prefix/lib64 does not
  trigger the failure because the directory pointed by OPENSSL_PREFIX does not
  contain lib64 subdirectory.

Makefile.PL

@@ -206,7 +206,8 @@ sub ssleay_get_build_opts {
  }
  }
 
- for ($prefix, "$prefix/lib64", "$prefix/lib", "$prefix/out32dll") {
+ # Note: the order matters for macOS Monterey.
+ for ("$prefix/lib64", "$prefix/lib", "$prefix/out32dll", $prefix) {
  push @{$opts->{lib_paths}}, $_ if -d $_;
  }