These marker comments are in every other zsyscall_*.go file generated by
mksyscall.pl and mksyscall_aix.pl. Also add them to the file generated
by mksyscall_solaris.pl.

Change-Id: Ic0ad5f28dd0a0934aa768f58ccc390b613a36abb
Reviewed-on: https://go-review.googlesource.com/c/141557
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>