[Conf] Improved the M4 macro file for MPICH2 (the mpich2version tool is no longer required).
[Conf] Improved the M4 macro file for MPICH2 (the mpich2version tool is no longer required).

airsim/avlcal,jwakely/rmol,airsim/avlcal,airsim/tvlsim,jwakely/airinv,airsim/sevmgr,jwakely/airinv,jwakely/simfqt,jwakely/rmol,jwakely/simfqt,jwakely/travelccm,jwakely/airinv,airsim/airinv,jwakely/airrac,jwakely/simcrs,airsim/rmol,airsim/airtsp,airsim/rmol,airsim/simfqt,airsim/simcrs,jwakely/trademgen,jwakely/rmol,airsim/airinv,airsim/simcrs,jwakely/rmol,airsim/tvlsim,airsim/rmol,jwakely/simcrs,jwakely/airinv,jwakely/airinv,airsim/simlfs,airsim/tvlsim,jwakely/travelccm,airsim/airrac,airsim/tvlsim,airsim/airinv,airsim/airinv,airsim/tvlsim,airsim/stdair,airsim/trademgen,airsim/airrac,jwakely/airrac,airsim/tvlsim,airsim/sevmgr,jwakely/trademgen,airsim/trademgen,airsim/stdair,jwakely/airinv,airsim/simlfs,jwakely/simfqt,airsim/tvlsim,airsim/airinv,airsim/airinv,airsim/trademgen,airsim/sevmgr,jwakely/trademgen,jwakely/simcrs,airsim/simfqt,airsim/tvlsim,airsim/avlcal,airsim/airinv,jwakely/airinv,airsim/airinv,airsim/airrac,airsim/simlfs,airsim/travelccm,airsim/stdair,airsim/simcrs,jwakely/airinv,jwakely/airrac,airsim/travelccm,airsim/tvlsim,airsim/airinv,jwakely/airinv,airsim/airtsp,airsim/simfqt,airsim/rmol,airsim/avlcal