Contrib goolf 1.4.20

this goolf uses the same GCC compiler like #928 (GCC/4.7.4) and provides incremental upgrades for all the underlying components; this toolchain is expected to have maximal compatibility with debuggers.

The intention is to use it with recursive --try, to provide debugg-able builds.
On top of that, afaik, OpenMPI v1.7.x is considered/tagged as being a non-production version (no references right now, but I've heard this from multiple angles).