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.

Changes

@@ -53,6 +53,11 @@ Revision history for Perl extension Net::SSLeay.
  functions return double and options functions return
  long. This partially fixes GH-315, 32bit integer Perls need
  to be handled separately.
+ - Work around macOS Monterey build failure during 'perl
+ Makefile.PL' that causes perl to exit with 'WARNING:
+ .../perl is loading libcrypto in an unsafe way' or similar
+ message. This fixes GH-329. Thanks to Daniel J. Luke for the
+ report and John Napiorkowski for additional help.
 
 1.91_01 2021-10-24
  - Correct X509_STORE_CTX_init() return value to integer. Previous

Makefile.PL

@@ -218,9 +218,25 @@ sub ssleay_get_build_opts {
  }
  }
 
- # Note: the order matters for macOS Monterey.
- for ("$prefix/lib64", "$prefix/lib", "$prefix/out32dll", $prefix) {
- push @{$opts->{lib_paths}}, $_ if -d $_;
+ # Directory order matters. With macOS Monterey a poisoned dylib is
+ # returned if the directory exists without the desired
+ # library. See GH-329 for more information. With Strawberry Perl
+ # 5.26 and later the paths must be in different order or the link
+ # phase fails.
+ my @try_lib_paths = (
+ ["$prefix/lib64", "$prefix/lib", "$prefix/out32dll", $prefix] => sub {$OSNAME eq 'darwin' },
+ [$prefix, "$prefix/lib64", "$prefix/lib", "$prefix/out32dll"] => sub { 1 },
+ );
+ while (
+ !defined $opts->{lib_paths}
+ && defined( my $dirs = shift @try_lib_paths )
+ && defined( my $cond = shift @try_lib_paths )
+ ) {
+ if ( $cond->() ) {
+ foreach my $dir (@{$dirs}) {
+ push @{$opts->{lib_paths}}, $dir if -d $dir;
+ }
+ }
  }
 
  print <<EOM;