[dev] [dwm] Fibonacci layout for 5.8

I just applied my the Fibonacci patch to dwm 5.8.1 and it compiled and ran
without problems. I haven't tested it on a multi-head setup so I can't be
sure it works perfectly under those conditions. I'll update the wiki
momentarily, but until then you can use the previous patch version (since
it's identical) which I've attached.

As a note, the patch does not add mod+key options to switch to the layouts,
that I leave up to the user.

-Niki Yoshiuchi