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.
OK, comment addressed; current understanding is that 1.4.20 should have the 1.6.6 variety, which is currently in release candidate status. In short, let's revisit this after a couple of weeks.

Reminder: this PR is meant to be latest & compatible with debuggers versions.

IMPORTANT: 
Dependencies to Autotools have been removed, they are considered redundant ;-)