crashplan: 3.6.4 -> 4.6.0

* the major change is to set TARGETDIR=${vardir}, and symlink from
  ${vardir} back to ${out} instead of the other way around.  this
  gives CP more liberty to write to more directories -- in particular
  it seems to want to write some configuration files outside of conf?

* run.conf does not need 'export'

* minor tweaks to CrashPlanDesktop.patch