For some reason I didn't completely re-generate the zsyscall_linux_*
files for all GOARCHes during review of CL 135915. Do so now such that
the flags parameter is of type int on all GOARCHes.

Change-Id: Ifc4afacfbedb70f3818b23ed3ea468745bbdb455
Reviewed-on: https://go-review.googlesource.com/136296
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>