[package] [mediacenter-osmc] update sources before installing kodi deps
[package] [mediacenter-osmc] need git package to switch branches
[package] common.sh: don't set up procfs for all packages; [mediacenter-osmc] set up procfs for jre
[package] [mediacenter-osmc] don't depend on git for checkouts
[package] [mediacenter-osmc] cosmetic