python27 and semaphore.h on 9.0-RC1

[Warren Block]

Something is not right with python27-2.7.2_2 
and /usr/include/sys/semaphore.h on 9.0-RC1.

# make -C /usr/src check-old
>>> Checking for old files
/usr/include/sys/semaphore.h

Yet if that file is not present:

cc -c -fno-strict-aliasing -O2 -pipe -D__wchar_t=wchar_t  -fno-strict-aliasing -DNDEBUG -O2 -pipe -D__wchar_t=wchar_t  -fno-strict-aliasing  -I. 
-IInclude -I./. ./Include -fPIC -DPy_BUILD_CORE -o Python/thread.o ./../Python/thread.c
In file included from ./../Python/thread.c:121:
./../Python/thread_pthread.h:55:23: error: semaphore.h: No such file or directory