zbar: Add python dependencies

crrev.com/c/1688352 converted zbar to python-single-r1, but it didn't
use the dependencies exported from the eclass, so zbar still fails
to build if it happens to be emerged before python.  Add the missing
dependencies to ensure python is available first.

BUG=chromium:984804
TEST=emerge-grunt --unmerge python; emerge-grunt zbar

Change-Id: I3c67c42cd40e4211ce09bece816f434fb9525d46
(cherry picked from commit 968a232532cea1fdd2f8c58850b56f66f138d025)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/1740206
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
2 files changed