tlp-0.3.7.1.ebuild fixed paching

Dear André Erdmann

I've patched the tlp-0.3.7.1.ebuild so it can patch again the sources.
But while I was uploading my patch I realise that you released 0.3.8.1 already.
So I don't believe you need my changes, but it would be great in the case you do because it's my first constructive input it would make me happy that my first steps were not meaningless.

Many thanks
Burak Aktas