SeekEOF function

  DECLARATION:  SeekEOF [ (var F : Text) ]

      PURPOSE:  Returns the end-of-file status of a file

         UNIT:  System

  RESULT TYPE:  Boolean

      REMARKS:  This function corresponds to the EOF function, except that
                it skips all blanks, tabs, and end-of-line markers before
                returning the end-of-file status.

                NOTE: With {$I-}, errors are returned through IOResult

  RESTRICTIONS:   Can only be used on Text files.
                File must be previously opened.