Cleaning does not work with -p flag

[Pavel Pletenev]

Create project folder with:

lbuild -c some/path/to.xml -p ../yet/another/path/ build

Then run the following command:

lbuild -c some/path/to.xml -p ../yet/another/path/ clean

It reports happily cleaning the folder, but the "cleaned" files remain in place

[Niklas Hauser]

Probably an issue with not finding the .log file and/or not relocating it's paths correctly. I'll have a look.