when installing from the binaries package do not install dependencies for / or configure experimental packages
the timidity files and doom wad need to be set up as part of configure so they get sorted when doing a binary installation. the prboom.wad also needs
to be installed (and then copied over to configure)
add a workaround for git hanging in a chroot environment (known qemu issue) by downloading a pregenerated tar.gz from github
when building in a chroot.
use local variables to make code more readable
Merge branch 'master' of github.com:petrockblog/RetroPie-Setup into upstream_master