Commit 0055c6a introduced a new preConfigure hook that sets the right
qmake path. Unfortunately the mkDerivation attributes of cool-retro-term
override the whole configurePhase, so this hook isn't run at all.
This fixes the build of cool-retro-term and it now successfully compiles
on my machine.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>