On linux/s390x these fields are already hidden. Don't export them on any
other platform either.

Preparatory CL for https://golang.org/cl/106656

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Also avoid installing recommended packages if possible to silightly
reduce the Docker image size.

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Fixes golang/go#24649
Fixes golang/go#24677

Change-Id: I3faa74ab68e093a097c3f2a8ec7c054431bdfb3f
Reviewed-on: https://go-review.googlesource.com/104736Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Move the common Getsockopt* implementations to syscall_unix.go instead
of duplicating them in syscall_bsd.go and syscall_linux.go. This also
makes all of them available on Solaris and adds GetsockoptByte on Linux.

Change-Id: Ibf49b27be46be579e63e3b3e2ebc1504e5228d5f
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In a Linux user namespace that doesn't have UID 0 mapped, WriteMsgUnix
will return an EINVAL as the uid-valid-in-uns check comes first in the kernel.

Even if in a user and PID namespace, using the wrong PID in Ucred will
always give EPERM.

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Fixes golang/go#8760

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Same was done in CL 7940 for the syscall package.

Fixes golang/go#10838

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Fixes golang/go#24515

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Re-run ./mkall.sh to avoid exporting Pad_cgo* fields on Darwin.

Updates golang/go#18632

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On Illumos, TestFchmodat fails with:

--- FAIL: TestFchmodat (0.00s)
        syscall_unix_test.go:502: Fchmodat: unexpected error: operation not supported on transport endpoint

Like Linux, Illumos doesn't support flags != 0 in Fchmodat, see
https://illumos.org/man/2/chmod

Adjust TestFchmodat accordingly to handle EOPNOTSUPP on Illumos.

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Now that Fchmodat is available on all Unices, move TestFchmodat to
syscall_unix_test.go and adjust it such that Fchmodat with
AT_SYMLINK_NOFOLLOW in flags is tested where supported.

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Change-Id: I3fd96550d588373d75e14bd554d46e2590c266fb
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This should call unix.Exec, not syscall.Exec. Thanks Tobias Klauser
for the spot.

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Currently the doc string forms one run-on sentence when viewed in
a browser. Add an additional newline so the text is presented in
a browser the same way it is in the source code.

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The syscall execve has no wrapper in this library, which it seems like
it should - Ian seemed to concur in CL 72550.

Add a docstring and an example, because I always get confused about
how to invoke the syscall.

Change-Id: I6100bbbf4ace9e3e341bf186a04cc03301da9aea
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Also enable TestFstatat for all Unices now that they all implement
Fstatat.

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Updates golang/go#24185

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Re-run ./mkall.sh to avoid exporting Pad_cgo* fields on dragonfly/amd64.
This also adds some additional RLIMIT_* constants.

Updates golang/go#18632

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Re-run ./mkall.sh to avoid exporting Pad_cgo* fields on solaris/amd64.
Akin to CL 89495.

Updates golang/go#18632

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Updates golang/go#24381

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The basic Getrlimit functionality is already tested in TestRlimit. Use
the Linux-specific test to check whether setting RLIMIT_AS has the
desired effect regarding mmap, as specified in
http://man7.org/linux/man-pages/man2/getrlimit.2.html

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Fixes golang/go#23361

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Because you can't bind a thread to the second CPU if it's not there.

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The timeout parameter might be nil, don't dereference it
unconditionally.

CL 97819 did the same for the syscall package.

Updates golang/go#24189

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The existing implementation requires QUERY_VALUE and ENUMERATE_SUB_KEYS permissions to enumerate
subkeys, so, using registry key name limits, Stat function could be excluded
from methods body and improved method requires only ENUMERATE_SUB_KEYS permission

Registry elements size limits described there:
https://msdn.microsoft.com/library/windows/desktop/ms724872.aspx

Fixes golang/go#23869

Change-Id: Id96beb9b0b294f01cc6eb1bb53bee5f50d02ea7e
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Add all IFLA_* constants defined in linux/if_link.h as of Linux kernel
version 4.15.

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Also use the Ubuntu 17.10 docker image and additionally install bison
which is needed by the glibc build.

The resulting change only consists of a few additional constants.
Exclude the X86_CR3_PCID_NOFLUSH constant on 386 and amd64, though.

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