unix: add watchdog constants on Linux

To be used e.g. in
https://github.com/gokrazy/gokrazy/commit/2e60d5b8c8c35e0eed1bb155c7d709c729c8f041

Change-Id: If79ffec9021dc79375c861a0ddd9dd443adb4692
Reviewed-on: https://go-review.googlesource.com/72375
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/unix/zerrors_linux_386.go b/unix/zerrors_linux_386.go
index 245f585..b40d9d8 100644
--- a/unix/zerrors_linux_386.go
+++ b/unix/zerrors_linux_386.go
@@ -1873,6 +1873,17 @@
 	WALL                                 = 0x40000000
 	WCLONE                               = 0x80000000
 	WCONTINUED                           = 0x8
+	WDIOC_GETBOOTSTATUS                  = 0x80045702
+	WDIOC_GETPRETIMEOUT                  = 0x80045709
+	WDIOC_GETSTATUS                      = 0x80045701
+	WDIOC_GETSUPPORT                     = 0x80285700
+	WDIOC_GETTEMP                        = 0x80045703
+	WDIOC_GETTIMELEFT                    = 0x8004570a
+	WDIOC_GETTIMEOUT                     = 0x80045707
+	WDIOC_KEEPALIVE                      = 0x80045705
+	WDIOC_SETOPTIONS                     = 0x80045704
+	WDIOC_SETPRETIMEOUT                  = 0xc0045708
+	WDIOC_SETTIMEOUT                     = 0xc0045706
 	WEXITED                              = 0x4
 	WNOHANG                              = 0x1
 	WNOTHREAD                            = 0x20000000