[LinuxBIOS] svn and firewall

[Robert Millan]

http://linuxbios.org/index.php/Download_LinuxBIOS says that if you are behind a
firewall that blocks the svn port, you can work around this by using https for
checkout.

However, in practice this doesn't really work, because at some point it will
run into the "fetching external item" hack for the util/ directory, and hang
there.

I would suggest removing the external item hack, and referring to the real
util/ URL instead.