Silence output from locale-gen

We run this command in the background (see line 416), hence its output
will overlap with output from whatever runs after it. Note that we keep
the error output, only silencing the standard output.

BUG=chromium:1243305
TEST=manually ran cros_sdk and output from locale-gen is not visible

Change-Id: I2762b6121f900d3ca8f783731b56baaea7f86cb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3118625
Auto-Submit: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Tested-by: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
1 file changed