eliminate error_state from most header files * defun-int.h, event-queue.h, graphics.in.h, oct-handle.h, ov-classdef.h, misc/f77-fcn.h, unwind-prot.h: Eliminate use of global error_state variable.

      program main
      integer i
      double precision d1mach
      double precision t1, t2
      do 10 i = 1, 5
        print *, d1mach (i)
   10 continue
      end