chore: inline format args

(backport <https://github.com/rust-lang/libc/pull/4416>)
(cherry picked from commit 444d9df5606f5b848f338f03b5be00581cb44f1f)

Remove license headers

Add an integration test for the cmsg(3) functions.

Since these are defined in C as macros, they must be reimplemented in
libc as Rust functions. They're hard to get exactly right, and they
vary fro

Add an integration test for the cmsg(3) functions.

Since these are defined in C as macros, they must be reimplemented in
libc as Rust functions. They're hard to get exactly right, and they
vary from platform to platform. The test builds custom C code that uses
the real macros, and compares its output to the Rust versions' output
for various inputs.

Skip the CMSG_NXTHDR test on sparc64 linux because it hits a Bus Error.

Issue #1239

Skip the entire cmsg test program on s390x because it dumps core
seemingly before the kernel finishes booting.

Issue #1240

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Fix OSX builders on CI

Looks like Travis has moved on from our old images, so we're forced to
update.

Touch up the iOS deploy script

Removed non-mandatory UIRequiredDeviceCapabilities

It’s not clear if these values are used or needed by the simulator. The doc only seems to mention arm values for the actual device:
https://develop

Removed non-mandatory UIRequiredDeviceCapabilities

It’s not clear if these values are used or needed by the simulator. The doc only seems to mention arm values for the actual device:
https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW3

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Replace Python script with Rust script.

Fix i386-apple-ios

Pass the tests only if we find an expected positive output (rather than checking for negative output to fail the tests).

Update output check based on all.rs test output

Run the unit tests on the iOS simulator for x86_64-apple-ios