Fix sanitisers compilation in PR#113

[dcillera]

Compilation option for sanitisers added in cmake configuration

[tedjpoole]

I think we also need a target_compile_options(...) for the bssl-compat library target

[dcillera]

I think we also need a target_compile_options(...) for the bssl-compat library target

And target_link_options too?

[tedjpoole]

No, target_link_options() is only needed on the executable targets utests-boring and utests-bssl-compat

[tedjpoole]

@dcillera do you want to continue with this PR, or do you think it would be better to start another using the work you subsequently did using arsenm/sanitizers-cmake?

[dcillera]

@tedjpoole I think it's better to create a new one.

[tedjpoole]

Superseded by #121