[Bug 224443] exp-run: SysV IPC API cleanup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224443

            Bug ID: 224443
           Summary: exp-run: SysV IPC API cleanup
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: brooks at FreeBSD.org
            Blocks: 224299, 224300

The System V message queue and semaphore headers and APIs contain a number of
mistakes.   Some types are declared that should not be, and the *id_ds structs
contain kernel-only members.

The review https://reviews.freebsd.org/D13538 contains a patch which removes
the types that should not be declared, fixes the system as required, and
renames the kernel-only, non-standard members to break existing consumers (if
any).  This isn't expected to break much as standard autoconf macros exist to
detect the most common issue (improperly declaring union semun).  The *is_ds
member changes are to explore the possibility of revising the APIs to remove
the members.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224299
[Bug 224299] sys/msg.h improperly declares struct mymsg
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224300
[Bug 224300] sys/sem.h improperly declares union semun
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