CI: turn on ASan and UBSan

I just noticed that libwayland test suite is ASan and UBSan clean, so
let's turn that on in CI to avoid regressing.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
3 jobs for mr/asan in 2 minutes and 36 seconds (queued for 3 seconds)
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Status Job ID Name Coverage
  Review
passed #10081945
check-commit

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  Prep
passed #10081946
debian:buster@container-prep

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  Build
passed #10081947
build-native

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