r273918 buildworld broke at semaphore

First breakage in a long time. Error is:

In file included from cancelpoints_sem_new.c:47:
/usr/src/lib/libc/../../include/semaphore.h:41:16: error: field has
incomplete type 'struct _usem2'
        struct _usem2   _kern;
                        ^
/usr/src/lib/libc/../../include/semaphore.h:41:9: note: forward declaration
of 'struct _usem2'
        struct _usem2   _kern;
               ^
cancelpoints_sem_new.c:66:33: error: use of undeclared identifier
'USEM_MAX_COUNT'
_Static_assert(SEM_VALUE_MAX <= USEM_MAX_COUNT, "SEM_VALUE_MAX too large");
                                ^
cancelpoints_sem_new.c:335:15: warning: implicit declaration of function
'USEM_COUNT' is invalid in C99 [-Wimplicit-function-declaration]
        *sval = (int)USEM_COUNT(sem->_kern._count);
                     ^
cancelpoints_sem_new.c:342:23: error: use of undeclared identifier
'UMTX_OP_SEM2_WAKE'
        return _umtx_op(sem, UMTX_OP_SEM2_WAKE, 0, NULL, NULL);
                             ^
cancelpoints_sem_new.c:361:23: error: use of undeclared identifier
'UMTX_OP_SEM2_WAIT'
        return _umtx_op(sem, UMTX_OP_SEM2_WAIT, 0,
                             ^
cancelpoints_sem_new.c:445:14: error: use of undeclared identifier
'USEM_HAS_WAITERS'
        if (count & USEM_HAS_WAITERS)
                    ^
1 warning and 5 errors generated.




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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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