Fix OpenSSL shared flag issue

This is a fix for issue #1468 where `--enable-shared` was throwing off the OpenSSL config script. After making the fix I ran `rvm --debug pkg install openssl` to ensure the config line was proper:

```
./config -I/home/cwgem/.rvm/usr/include -L/home/cwgem/.rvm/usr/lib zlib no-asm no-krb5 --prefix=/home/cwgem/.rvm/usr shared
```

Config completed and compile continued as normal.