find_package_of(): don't use |&

Use 2>&1 instead of |& because the latter is not supported by all shells.

BUG=chromium:220828
TEST=manual

Change-Id: I481720c1c5847a14ef32b13134be3200f9daf033
Reviewed-on: https://chromium-review.googlesource.com/241175
Reviewed-by: Grant Grundler <grundler@chromium.org>
Tested-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
Tested-by: Frank Henigman <fjhenigman@chromium.org>
1 file changed