perl/ssleay: fix openssl prefix

This is quite ugly, but I found no other way.

:multiple-outputs:

pkgs/top-level/perl-packages.nix

@@ -5231,8 +5231,14 @@ rec {
       sha256 = "1fkpdlpg99rdq2vlm6bgmqc8iazhcrfzvbpwxnn20k0viwpy7v28";
     };
     buildInputs = [ pkgs.openssl ];
-    OPENSSL_PREFIX = pkgs.openssl;
     doCheck = false; # Test performs network access.
+    preConfigure = ''
+      mkdir openssl
+      ln -s ${pkgs.openssl.out}/lib openssl
+      ln -s ${pkgs.openssl.bin}/bin openssl
+      ln -s ${pkgs.openssl.dev}/include openssl
+      export OPENSSL_PREFIX=$(realpath openssl)
+    '';
     meta = {
       description = "Perl extension for using OpenSSL";
       license = "SSLeay";