Fix multithread reproducibility in TMVA generated code used by PrLongLivedTracking

Gerhard Ravenrequested to merge
18-mva-generated-code-is-not-thread-safe-follow-up-from-prlonglivedtracking-remove-use-of-static-in-mlp into master

Closes #18 (closed)

Edited by Gerhard Raven

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