libgo: handle stat st_atim32 field and SYS_SECCOMP
libgo: handle stat st_atim32 field and SYS_SECCOMP

Patches for musl support, from Sören Tempel.

Fixes https://gcc.gnu.org/PR105225

Change-Id: If396877d4a4c7d27962226d7a6e3bb91b1344413
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/415294
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>

golang/gofrontend,golang/gofrontend,golang/gofrontend,golang/gofrontend