gitlab-ci.yml: Add jobs to test CFI flags

QEMU has had options to enable control-flow integrity features
for a few months now. Add two sets of build/check/acceptance
jobs to ensure the binary produced is working fine.

The two sets allow testing of x86_64 binaries for every target
that is not deprecated.

Signed-off-by: Daniele Buono <dbuono@linux.vnet.ibm.com>
124 jobs for cfi-ci in 189 minutes and 19 seconds (queued for 5 seconds)
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