[OpenBIOS] making switch-arch executable

[Programmingkid]

I made a change to the documentation on the page http://www.openfirmware.info/OpenBIOS. I added a step in the Building OpenBIOS section to make the switch-arch script executable. I was wondering if it is possible to download OpenBIOS with the script being executable without the user having to change it permissions. This would save some time and frustration.