Quiet down generate_deb_tarball()

It was printing obnoxious numbers of warnings due to duplicate files
in the generated tarballs.

Change-Id: I0dcc7500e2791a380bf352b8657fb1d6a54b8082
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/debian/packages.bzl b/debian/packages.bzl
index 8c4ab68..30bfef7 100644
--- a/debian/packages.bzl
+++ b/debian/packages.bzl
@@ -137,6 +137,9 @@
     pkg_tar(
         name = name,
         extension = "tar.gz",
+        # TODO(james): It probably isn't ideal that we have duplicates floating
+        # around, but the warnings from it are quite noisy.
+        allow_duplicates_from_deps = True,
         deps = ["extracted_%s.tar" % dep for dep in deps],
         target_compatible_with = target_compatible_with,
     )