config.map: move _THREADED_X to IB/CMSSW_7_1_X/jemalloc350

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge pull request #373 from davidlt/move-threaded-to-jemalloc350

config.map: move _THREADED_X to IB/CMSSW_7_1_X/jemalloc350