Structs starting with `e' in bsd/hfs/hfscommon/headers

• ExtendedFCB bsd/hfs/hfscommon/headers/FileMgrInternal.h:556
• ExtendedVCB bsd/hfs/hfscommon/headers/FileMgrInternal.h:459
• ExtendedWDCB bsd/hfs/hfscommon/headers/FileMgrInternal.h:570