Add missing include to fix compilation error in dev3
Fixes
Phys/MVADictTools/src/lib/TMVATransform.cpp:75:35: error: variable 'std::ifstream fin' has initializer but incomplete type
75 | std::ifstream fin( m_weightfile );
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Broken in dev3 (also with gcc 9.2.0) but not in dev4 or in LCG_97a - probably due to some change in the includes picked up from ROOT
Edited by Marco Cattaneo