[Bug 278145] devel/plan9port: new kenv system call causes build error on STABLE and CURRENT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278145

            Bug ID: 278145
           Summary: devel/plan9port: new kenv system call causes build
                    error on STABLE and CURRENT
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: jfc@mit.edu
                CC: felix@userspace.com.au
                CC: felix@userspace.com.au
             Flags: maintainer-feedback?(felix@userspace.com.au)

The newly introduced kenv() declaration in <unistd.h> causes compilation of
plan9port to fail.  The function is not yet in any FreeBSD release, having been
added in January, 2024.

Also reported upstream at https://github.com/9fans/plan9port/issues/648.

9c -O2 -pipe -march=znver1  -fstack-protector-strong -isystem
/usr/local/include -fno-strict-aliasing  sort.c
sort.c:111:5: error: conflicting types for 'kcmp'
/usr/include/unistd.h:522:6: note: previous declaration is here
sort.c:205:28: error: too few arguments to function call, expected 5, have 2
/usr/include/unistd.h:522:6: note: 'kcmp' declared here
sort.c:451:42: error: too few arguments to function call, expected 5, have 2
/usr/include/unistd.h:522:6: note: 'kcmp' declared here
sort.c:470:46: error: too few arguments to function call, expected 5, have 2
/usr/include/unistd.h:522:6: note: 'kcmp' declared here
sort.c:488:1: error: conflicting types for 'kcmp'
/usr/include/unistd.h:522:6: note: previous declaration is here
sort.c:514:41: error: too few arguments to function call, expected 5, have 2
/usr/include/unistd.h:522:6: note: 'kcmp' declared here
mk: 9c -O2 -pipe ...  : exit status=exit(1)

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