Added --with-system-type=<systype> and --with-machine-type=<machtype>
  options, to be able to override the one detected, for --version strings
field.cc, field.h, listener.cc:
  C++ compatibility change for IBM VisualAge 6 and i5/OS


configure.in:
  Added --with-system-type=<systype> and --with-machine-type=<machtype>
  options, to be able to override the one detected, for --version strings
server-tools/instance-manager/listener.cc:
  C++ compatibility change for IBM VisualAge 6 and i5/OS
sql/field.cc:
  C++ compatibility change for IBM VisualAge 6 and i5/OS
sql/field.h:
  C++ compatibility change for IBM VisualAge 6 and i5/OS