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In Debian testing, lib32gcc1 is replaced by lib32gcc-s1 and no longer
installable.

BUG=chromium:1119692
TEST=./install-build-deps on rodete.

Change-Id: I47a8e9d07ac0478a33cf31c6d8566a0e0f98aad1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366381
Auto-Submit: Junichi Uekawa <uekawa@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800353}