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build_externals: Fix build caching for LCG version change

Frank Winklmeier requested to merge fwinkl/athena:cache_externals into master

The externals build caching did not work correctly when the LCG version was being changed via a cmake command line argument. Fix this by adding a hash of the extra cmake parameters to the stamp file.

Fixes ATLINFR-3018.

Edited by Frank Winklmeier

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