XPenvOrig()
  Return Pointer to original Environment strings.
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  Function:    XPenvOrig()

               Used by XPenvPtr() to set the Environment strings to
               Point to the Original strings, so Child processes
               can make good use of it.
               See XPDEMO.PRG, the Shell to DOS option for more info.

  Syntax:      XPenvOrig()

  Arguments:   None

  Returns:     A number, The segment of the original environment
               For the current Clipper application.

  Usage:       See XPenvPtr(), XPsetEnv()