VxWorks: add functions for message queue

Add TCP FastOpen support for macOS

add wmemchr to all platforms support memchr (except wasi)

Switch macOS images to 10.14

fix #1632

Bump to 0.2.67.

Add memmem

Includes bindings for the libc function gmtime_s.

Add FFI bindings for libc's gmttime_s.

Add qsort, qsort_r and bsearch

memmem is a non-standard extension, first added in GNU libc and later
ported to other systems. Support for it is non-uniform, thus it was only
added to platforms that seem to support it.

Fix CI

Recent build of vs2017-win2016 image does not have GNU find in path.
Instead, Windows built-in version was invoked, causing `Find GCC libraries`
Azure CI stage to fail.

This triggers a warning on a recent nightly, which in turn breaks CI due to
`#![deny(warnings)]` in libc-test/build.rs

i686-apple-darwin and other 32bit Apple targets ware demoted to tier-3 due
to lack of support from the vendor, and is no longer available from rustup
for nightly, shortly beta.

DockerOSX32 job was removed as it only tests on nightly. BuildChannelsOSX job
will continue testing on these targets on older compilers (stable and below).

Add Redox FD_* function-macros and Android AI_* constants

I'm not sure if I'm allowed to add multiple, separate APIs in the same PR, but I guess they're both for uncommon/exotic platforms?

The `AI_*` constants were taken from `usr/include/netdb.h` on my Termux install; the `FD_` functions were taken from `linux_like/mod.rs`.

Add dlmopen dlinfo and related consts.

I actually have no idea if the constants I copied from my computer are cross-platform.

Solarish: Fix utmx Debug impl and re-add support for extra traits

Fix a bug where the compilation failed cause `utmpx.host` is bigger than 32 so we cannot print it.

Due to a break of compilation (only with extra trait enabled) on a Tier 2 platform, I do think it would be better to do another release as soon as proven fixing compilation

Add sock_extended_err and associated constants from errqueue.h to linux_like

This is an alternate version of #1614 that attempts to fix issues with the android ctests by rearranging the headers.  Due to long CI cycle time, I've opened it as an alternate PR.  Only one or the other should merge, depending if linux_like or linux is the correct place for this.

sock_extended_err is a struct returned as a control message when the sockopt
IP_RECVERR is set, when recvmsg has the MSG_ERRQUEUE flag set. IP_RECVERR and
MSG_ERRQUEUE are constants both already defined here.

Update bindings for the wasm32-wasi target

This commit performs a number of updates for libc with the `wasm32-wasi`
target:

* Updates the `wasi-libc` repository commit used (previously known as
  `wasi-sysroot`)
* Updates the container to Ubuntu 19.10 which has Clang 9 packaged which
  is all we need.
* Avoids building `wasmtime` and instead downloads a precompiled binary.
* Updates bindings in `src/wasi.rs` to match the current upstream state.