unix: add more SECCOMP constants

Update the SECCOMP regex to fetch more SECCOMP constants.

Change-Id: I192ff7cb11fc38f0b0f08d6cba0a4f8649f9775e
Reviewed-on: https://go-review.googlesource.com/c/sys/+/553776
LUCI-TryBot-Result: Go LUCI <[email protected]>
Run-TryBot: Tobias Klauser <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>
Reviewed-by: Matt Layher <[email protected]>

Author: florianl

unix/mkerrors.sh

@@ -584,7 +584,7 @@ ccflags="$@"
 		$2 ~ /^KEY_(SPEC|REQKEY_DEFL)_/ ||
 		$2 ~ /^KEYCTL_/ ||
 		$2 ~ /^PERF_/ ||
-		$2 ~ /^SECCOMP_MODE_/ ||
+		$2 ~ /^SECCOMP_/ ||
 		$2 ~ /^SEEK_/ ||
 		$2 ~ /^SCHED_/ ||
 		$2 ~ /^SPLICE_/ ||