Otherwise linking could error like:
```
/usr/local/bin/ld: /usr/local/lib/libboost_python27.so: undefined reference to `PyUnicodeUCS4_FromEncodedObject'
/usr/local/bin/ld: /usr/local/lib/libboost_python27.so: undefined reference to `PyNumber_InPlaceDivide'
........
/usr/local/bin/ld: /usr/local/lib/libboost_python27.so: undefined reference to `PyStaticMethod_Type'
/usr/local/bin/ld: /usr/local/lib/libboost_python27.so: undefined reference to `PyTuple_Size'
c++: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[2]: *** [src/test/rgw/CMakeFiles/unittest_rgw_dmclock_scheduler.dir/build.make:147: bin/unittest_rgw_dmclock_scheduler] Error 1
```
Signed-off-by: Willem Jan Withagen <wjw@digiware.nl>
# unitttest_rgw_dmclock_queue
add_executable(unittest_rgw_dmclock_scheduler test_rgw_dmclock_scheduler.cc $<TARGET_OBJECTS:unit-main>)
add_ceph_unittest(unittest_rgw_dmclock_scheduler)
-target_link_libraries(unittest_rgw_dmclock_scheduler ${rgw_libs} dmclock ${Boost_LIBRARIES})
+target_link_libraries(unittest_rgw_dmclock_scheduler ${rgw_libs} dmclock)
if(WITH_BOOST_CONTEXT)
target_compile_definitions(unittest_rgw_dmclock_scheduler PRIVATE BOOST_COROUTINES_NO_DEPRECATION_WARNING)
target_link_libraries(unittest_rgw_dmclock_scheduler Boost::coroutine Boost::context)