Avoid including BasicCCDBManager in headers exposed to ROOT.

[ktf]

Root will happily embed references to curl.h and / or the kernel headers if found on the build machine
and die if they are not there on the node.

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[ktf]

@costing This should fix the problem you observed.

@AliceO2Group/async-maintainers I think we need this to run on async.

[ktf]

Get's seen by cling when creating a dictionary. The issue is that the PCMs created by root will happily refer to headers which were found on the build machine, failing then to work if they are not found anymore at runtime.