workaround for HPUX signal.h error, missing extern "C" 
    moved my_thread_end to NdbThreadExit
   more checks for shared memory transporter signum setup


acinclude.m4:
  backported configure flag from 5.0
include/my_global.h:
  workaround for HPUX signal.h error, missing extern "C"
ndb/src/common/portlib/NdbThread.c:
  moved my_thread_end to NdbThreadExit
ndb/src/mgmsrv/ConfigInfo.cpp:
  more checks for shared memory transporter signum setup