devops: do not bundle `libstdc++` with Firefox builds (#16103)
devops: do not bundle `libstdc++` with Firefox builds (#16103)

Turns out we were bundling x86_64 `libstdc++` with aarch64
builds on Ubuntu, which was useless and implies that this
library might not be needed at all.
microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright