MSYS: work in progress for rebuilding perl 5.8.8

This is an update of my work in progress towards fixing the msys to be able to cleanly rebuild perl 5.8.8 (which from my point of view is a necessary step to understand how perl is patched for MSYS, before trying to upgrade perl).

As this is work in progress and the task is hard (and I'm not sure to have all the tuits to achieve it just now) this serie of patches also include commits of log output (see ebaccfa6c2e21476ea8a4c4427ea7b94e2334dc9) that may help others taking over (and that will also help myself later).

Please apply this now on the `msys` branch. (I would prefer if you could rebase on my branch instead of merging with the Github merge button, to avoid polluting the history with merge commits).