build_packages: drop python2 forcing w/goma

It should work with Python 3 now.

BUG=chromium:1007384
TEST=CQ passes

Change-Id: I25585be8ef49c957b1c844875557eb30825dd6fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2065314
Reviewed-by: Michael Mortensen <mmortensen@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed