build_packages: don't install debug symbols by default

Debug symbols should only be installed when required or when explicitly
asked for (--withdebugsymbols).

BUG=chromium:455392
TEST=manual: build_packages does not install debug symbols by default.
TEST=trybots.

Change-Id: I04c2e02510a6b70e5992ae0a4d67983be9fa7289
Reviewed-on: https://chromium-review.googlesource.com/248110
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Trybot-Ready: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
1 file changed