ndb/src/common/portlib/Makefile.am:
  Rename from .c to .cpp as c++ features needed
ndb/src/common/portlib/NdbTCP.cpp:
  NDB_MUTEX_INITIALIZER isn't preset on SCO unix
ndb/src/ndbapi/Ndbinit.cpp:
  NDB_MUTEX_INITIALIZER isn't preset on SCO unix