[Bug 199486] usr.bin/make switch from memcpy() to memmove() for copying between overlapping buffers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199486

            Bug ID: 199486
           Summary: usr.bin/make switch from memcpy() to memmove() for
                    copying between overlapping buffers
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: venture37 at geeklan.co.uk

Created attachment 155648
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155648&action=edit
switch from memcpy() to memmove() in jobs.c

Attached patch:
Switches from memcpy() to memmove() when copying between overlapping buffers.
Adds a description of what max is and handle i reaching it again.

Taken from r1.79/1.80 of job.c from NetBSD, Issue with copying between
overlapping buffers found via building on OpenBSD.

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