IPRT: Windows 10 OS type.

RTSystemQueryOSInfo-win.cpp,init-win.cpp: Detect windows 8.1 correctly, it will try hide from us if we use GetVersionEx and the like. Fixed bug in service pack query where it would return ANSI strings instead of UTF-8 strings.

IPRT: Determin windows version on init and skip the SetDefaultDllDirectories on 32-bit vista. Also corrected RTSystemQueryOSInfo status reporting.