erlangR14: Use dev output of openssl

pkgs/development/interpreters/erlang/R14.nix

···
     sed -e s@/bin/pwd@pwd@g -i otp_build
   '';
 
-  configureFlags = "--with-ssl=${openssl}";
+  configureFlags = "--with-ssl=${openssl.dev}";
 
   hardeningDisable = [ "format" ];