gitlab-ci.yml: Add oss-fuzz build tests

This tries to build and run the fuzzers with the same build-script used
by oss-fuzz. This doesn't guarantee that the builds on oss-fuzz will
also succeed, since oss-fuzz provides its own compiler and fuzzer vars,
but it can catch changes that are not compatible with the the
./scripts/oss-fuzz/build.sh script.
The strange way of finding fuzzer binaries stems from the method used by
oss-fuzz:
https://github.com/google/oss-fuzz/blob/master/infra/base-images/base-runner/targets_list

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20200720073223.22945-1-thuth@redhat.com>
[thuth: Tweak the "script" to make it work, exclude slirp test, etc.]
Signed-off-by: Thomas Huth <thuth@redhat.com>

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