protobuf: core: use hex(custom field option) for blk_sigset field

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

protobuf/core.proto

@@ -7,13 +7,15 @@ import "timer.proto";
 
 import "siginfo.proto";
 
+import "opts.proto";
+
 message task_core_entry {
 	required uint32			task_state	= 1;
 	required uint32			exit_code	= 2;
 
 	required uint32			personality	= 3;
 	required uint32			flags		= 4;
-	required uint64			blk_sigset	= 5;
+	required uint64			blk_sigset	= 5[(criu).hex = true];
 
 	required string			comm		= 6;