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BINARY_PATH Fix, master branch (2021.07.03.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:BinaryPathFix-master-20210703 into master

Fixed the handling of <FOO>_BINARY_PATH in lcg_external_module(...), after debugging the issue in athena!44893 (merged).

In the previous implementation repeated calls to find_package(...) in the same context would lead to <FOO>_BINARY_PATH growing and growing, ever being extended by $<BUILD_INTERFACE:...> and $<INSTALL_INTERFACE:...> generator expressions.

I now changed the code to behave in the way in which lcg_external_python_module(...) has been operating for a long time. Introducing the internal _<FOO>_BINARY_PATH variable, which clients should not really have to know about.

@fwinkl, I'm afraid that athena!44893 (merged) will have to be put on hold until this update reaches the nightly. ☹

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