Implement detection of volumes with vulnerable XTS master key.

If vulnerability detected, a warning message is displayed during mount or backup/restore header, and changing the password is disallowed since it will not change the master key.

src/Common/Apidrvr.h

@@ -177,6 +177,7 @@ typedef struct
 	ULONG MaximumTransferLength;
 	ULONG MaximumPhysicalPages;
 	ULONG AlignmentMask;
+	BOOL VolumeMasterKeyVulnerable;
 } MOUNT_STRUCT;
 
 typedef struct
@@ -316,6 +317,8 @@ typedef struct
 	// is read-only (or mounted an outer/normal TrueCrypt volume as read only)
 	uint32 HiddenSysLeakProtectionCount;
 
+	BOOL MasterKeyVulnerable;
+
 } BootEncryptionStatus;