[Merge] ~xnox/ubuntu/+source/systemd:cet into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-groovy

[Dimitri John Ledkov]

Dimitri John Ledkov has proposed merging ~xnox/ubuntu/+source/systemd:cet into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-groovy.

Commit message:
ubuntu: enable CET on amd64.

CET is enabled by default in our toolchain, however currently toolchain forgets about that if lto is enabled, which it is by systemd. Specify -fcf-protection flag in LDFLAGS, to ensure that systemd is CET enabled whilst using lto.

I expect this patch to be temporary, and will be possible to drop once the toolchain is fixed later this cycle.

Requested reviews:
  Balint Reczey (rbalint)
  Dimitri John Ledkov (xnox)

For more details, see:
https://code.launchpad.net/~xnox/ubuntu/+source/systemd/+git/systemd/+merge/386467
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