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As discussed in <https://lists.alpinelinux.org/alpine-devel/6005.html>

(CVE-2018-5205, CVE-2018-5206, CVE-2018-5207, CVE-2018-5208)

Add check

This reverts commit f6759c96.

Rust was upgraded to 1.23 which no longer needs to import the trait AsciiExt:
https://blog.rust-lang.org/2018/01/04/Rust-1.23.html

Reverting for now until a patch is ready

https://embed.cs.utah.edu/csmith/
Tool for generating random C programs

This commit updates to kernel version 4.9.75 and enables
CONFIG_PAGE_TABLE_ISOLATION for x86, x86_64 and aarch64. For all
other architectures, CONFIG_PAGE_TABLE_ISOLATION is disabled.

CONFIG_PAGE_TABLE_ISOLATION mitigates the Meltdown security flaw
almost all Intel CPUs and some ARM CPUs are suspect to [1,2].
(This patch does not solve the Spectre security threat [2], which
affects also non-Intel CPUs [3].)

I believe this commit will cause some discussion, especially the
following points seem worth discussing:

 a) CONFIG_PAGE_TABLE_ISOLATION has a performance impact on
    syscalls, which can slow down specific applications
    significantly. AMD users might benefit from a kernel without
    KPTI (unless Meltdown turns out to affect them as well)
 b) Is disabling this feature a reasonable choice for CPU
    architectures different from x86, x86_64 and aarch64?

[1]: https://meltdownattack.com/#faq-systems-meltdown
[2]: http://kroah.com/log/blog/2018/01/06/meltdown-status/
[3]: https://meltdownattack.com/#faq-systems-spectre

Enable build on both arches as syncthinis is building fine on them.

Add a simple test as upstream doesn't provide a test suite.

Seems more tests are failing in the builders. Going to disable
all for now and investigate latter...

Disable a test for now that is failing in the builders.
It worked in my ppc64le LXC environment and also
in the Travis CI[1].

Need to investigate what is happening.

--
[1] - https://github.com/alpinelinux/aports/pull/3017