headers: allow GetComputerName/SetVolumeLabel in winstore builds https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-getcomputernamea https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-getcomputernamew https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setvolumelabela https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setvolumelabelw Signed-off-by: Liu Hao <lh_mouse@126.com>