when using shm transporter, set sigmask on each thread using pthread_sigmask


configure.in:
  Add more functions needed for SHM
ndb/src/common/portlib/NdbThread.c:
  1) Create thread wrapper function
  2) block SIGUSR1 #ifdef NDB_SHM_TRANSPORTER
ndb/src/common/transporter/TransporterRegistry.cpp:
  (un)block SIGUSR1 #ifdef NDB_SHM_TRANSPORTER
sql/ha_ndbcluster.cc:
  cast pointer to UintPtr before printout