Handle static boost libraries on windows.

Change-Id: I8f21f4d6c33c6dc15e5d9e0440e7e11072ce36e1
Merge branch 'boost_windows_static'

Change-Id: I8e0f8a55c64bc0193bf870fd5b3280f2ace69876
Prefer using the user specified value to Boost_USE_STATIC_LIBS.

Change-Id: I0308206e0efb0011199b002343d84dcdab4e0d7e
Merge branch 'boost_windows_static'

Change-Id: Ie5597d4591ece017ebb3fd65d4c5f12bf1712e49