mksysinfo: Fix syscall.F_GETLK and friends for 32-bit x86.
mksysinfo: Fix syscall.F_GETLK and friends for 32-bit x86.

R=iant
CC=gofrontend-dev
https://golang.org/cl/6461107

qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,golang/gofrontend,anlhord/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,golang/gofrontend,golang/gofrontend,anlhord/gofrontend,golang/gofrontend,qskycolor/gofrontend