Fix spurious errors on cerbero CI
ci: Fix spurious errors while building iOS / Android examples
Run the build scripts through a shell script that checks the output
and retries if the error was a known spurious error.
cerbero: Retry on spurious LLVM errors on macOS and Windows
We already unconditionally retry downloads, so that part of the issue
is already handled since !972.
Fixes #389 (closed)
Edited by Nirbheek Chauhan