unix: add UBI ioctl constants on Linux

Change-Id: Icde91c6504cd45d78208c6041bf6dc097d2d8334
Reviewed-on: https://go-review.googlesource.com/131235
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/mkerrors.sh

@@ -196,6 +196,7 @@ struct ltchars {
 #include <linux/watchdog.h>
 #include <linux/hdreg.h>
 #include <linux/rtc.h>
+#include <mtd/ubi-user.h>
 #include <net/route.h>
 #include <asm/termbits.h>
 
@@ -438,6 +439,7 @@ ccflags="$@"
 		$2 ~ /^SECCOMP_MODE_/ ||
 		$2 ~ /^SPLICE_/ ||
 		$2 !~ /^AUDIT_RECORD_MAGIC/ &&
+		$2 !~ /IOC_MAGIC/ &&
 		$2 ~ /^[A-Z][A-Z0-9_]+_MAGIC2?$/ ||
 		$2 ~ /^(VM|VMADDR)_/ ||
 		$2 ~ /^IOCTL_VM_SOCKETS_/ ||
@@ -446,6 +448,7 @@ ccflags="$@"
 		$2 ~ /^GENL_/ ||
 		$2 ~ /^STATX_/ ||
 		$2 ~ /^RENAME/ ||
+		$2 ~ /^UBI_IOC[A-Z]/ ||
 		$2 ~ /^UTIME_/ ||
 		$2 ~ /^XATTR_(CREATE|REPLACE|NO(DEFAULT|FOLLOW|SECURITY)|SHOWCOMPRESSION)/ ||
 		$2 ~ /^ATTR_(BIT_MAP_COUNT|(CMN|VOL|FILE)_)/ ||