[Bug 230046] [exp-run] Make timespecadd(3) and friends public

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230046

            Bug ID: 230046
           Summary: [exp-run] Make timespecadd(3) and friends public
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: asomers at FreeBSD.org
                CC: ports-bugs at FreeBSD.org

Created attachment 195458
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195458&action=edit
bring our timespecadd etc definitions in line with NetBSD's

The timespecadd(3) family of macros were imported from NetBSD back in r35029.
However, they were initially guarded by #ifdef _KERNEL. In the meantime, we
have grown at least 28 syscalls that use timespecs in some way, leading many
programs both inside and outside of the base system to redefine those macros.
It's better just to make the definitions public.

Our kernel's definitions of timespecadd and timespecsub are slightly different
than NetBSD's and OpenBSD's. This revision changes our definition to match
theirs.

This change could cause ports breakage if a port:
1) includes <sys/time.h>, 
2) locally defines timespecadd or a related macro, and
3) doesn't guard that definition with #ifndef timespecadd

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