Fix CI builds for new versions of dependencies from crates.io #158
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There's a weird problem caused be the newly released
bitflags-1.3.1
on CI on older rustcs. This causescargo build --bin test_executables_helper --features test_executables
to fail. Unfortunately we only execute that command from within the test-suite. And if it fails, the test-suite hangs. :( This PR makes the test-suite crash when this happens.Edit: point to bitflags instead of libc.