xAODTrigMissingETCnv+xAODBTaggingCnv+xAODCaloEventCnv+xAODTrigMinBiasCnv+xAODTrigBphysCnv: cmake fixes

Scott Snyderrequested to merge
ssnyder/athena:cmake.xAODTrigMissingETCnv-20200521 into master

Define interface libraries for headers exported from these packages.

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