FIXED: a bug in src/clock.c

[utzoo!decvax!ucbvax!dist2]

	Clock.c had not been properly converted to V7.  It used the old
method of interrupt handling, setexit() and reset() rather than setjmp()
and longjmp().  The necessary fixes are

	diff src/clock.c.old src/clock.c:
	4a5,7
	> #include	<setjmp.h>
	> jmp_buf	env;
	> 
	11c14
	< 	setexit();
	---
	> 	setjmp(env);
	35c38
	< 	reset();
	---
	> 	longjmp(env, 1);

These changes should be applied on all tapes written before 10/27/81.

			Carl