Added TAGLIB_EXPORT to RefCounter for Windows build
Merge pull request #219 from joelverhagen/master

Windows build fails on master (due to RefCounter not being exported)
Added FindShlwapi.cmake in lieu of pragma comment() in fileref.h.
Merge pull request #220 from FestusHagen/cmake_shlwapi

Added FindShlwapi.cmake in lieu of pragma comment() in fileref.h.