gitlab-ci: allow failure of clang LTO pipelines

Required for [1].

@tstellar-rh:

The core problem is that the dwarves tool doesn't support some debuginfo constructs that are emitted by LLVM. As long as this is true, we are always at risk of a similar build failure happening even with the default gcc + rust build. A small change to the rust compiler or a new version of LLVM code easily change the debuginfo emitted by rust and cause this issue to reappear.

[1] !3295 (merged)

Signed-off-by: Michael Hofmann mhofmann@redhat.com

Edited by Michael Hofmann

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