[boost] _WIN32_WINNT in thread\src\win32\thread.cpp and filesystem\src\operations.cpp

Why does win32\thread.cpp unconditionally define _WIN32_WINNT and WINVER? That's a bit rude, especially when I go to lengths to set them properly in a file I pass as BOOST_USER_CONFIG. :-( This also applies in filesystem\src\operations.cpp: in that case it does check that _WIN32_WINNT isn't defined already, but there has been no inclusion of config.h so BOOST_USER+CONFIG has not been processed yet. I would have though that in both cases the correct response is to remove these explicit settings and just: #include <boost/config.h> James (Using 1.39.0 on Vista, BTW - and setting _WIN32_WINNT by detection in my waf script)