SSL library is not portable

Config has to be rerun for SSL libraries to successfully compile [1].

See what this changes and if there is a portable way to avoid rerunning this:

```
./config threads -D_REENTRANT --openssldir \
    {PARSECDIR}/pkgs/libs/ssl/inst/amd64-linux.gcc-pthreads
```

[1] http://abhishek-sagar.blogspot.com/2012/06/parsec-md5-x8664s41-error-0xd76aa478.html
