PR #1098 added the CMSG_DATA(3) family of functions into libc.  Because
they're defined as macros in C, they had to be rewritten as Rust
functions for libc.  Also, they can't be tested in CI for the same
reason.  But that PR erroneously used the same definitions in BSD as in
Linux.

This commit corrects the definitions for OSX, FreeBSD, DragonflyBSD,
OpenBSD, and NetBSD.  I renamed a few variables and collapsed a few
macros in order to combine the definitions where possible.

Fixes #1210

Bump version to 0.2.47

This will release changes to the Redox module

mincore has been removed from upcoming OpenBSD 6.5

remove test from CI on OpenBSD for "mincore" function.

it has been removed from upcoming 6.5:
- https://marc.info/?l=openbsd-cvs&m=154723400730318
- https://github.com/openbsd/src/commit/54e4f6b9a1dc183e1dc7c4a722c2646aa309246a

I am only removing the test from CI, not touching exported function from Rust libc to avoid a breaking change.

Redox module update

This adds poll, mmap, and stat support

Comment FIOSEEK* until they're in a NetBSD release

Accidentally included two constants that aren't in the current release of NetBSD.

While this doesn't impact libc-consumers, failing the testsuite on latest NetBSD isn't ideal.

I've commented them out; they can be reintroduced when the next NetBSD ships with them included.

glibc x86: add the register offset constants for mcontext_t.gregs

Constants calculated from the [glibc source](https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86/sys/ucontext.h;h=3d883c2bf1220ef50cedc6b1491d699c0727c508;hb=HEAD). These are needed when using `mcontext_t`. Thanks!

add FIO* for FreeBSD and NetBSD

Calculated [here](https://repl.it/repls/PaltryTroubledMonitors) from FreeBSD [source](https://github.com/freebsd/freebsd/blob/9867e6d8fe1cac34121e5f2df9357363f5659617/sys/sys/filio.h).

Calculated [here](https://repl.it/repls/ProfitableImpracticalComputeranimation) from NetBSD [source](https://github.com/NetBSD/src/blob/64b8a48e1288eb3902ed73113d157af50b2ec596/sys/sys/filio.h).

Some of these are likely identical across all BSDs – if this can be confirmed they could be elevated to `unix/bsd/mod.rs` alongside `FIOCLEX` and `FIONBIO`.

Remove sys/ioctl_compat.h from DragonFlyBSD tests.

Per the mailing list[1], sys/ioctl_compat.h has been removed.  This should fix #1198.

1: http://lists.dragonflybsd.org/pipermail/commits/2018-April/672079.html

Per the mailing list[1], sys/ioctl_compat.h has been removed.

1: http://lists.dragonflybsd.org/pipermail/commits/2018-April/672079.html

Fix uname on FreeBSD

On FreeBSD, uname is an inline function.  The uname that is present in
libc.so is for FreeBSD 1.0 compatibility.  It expects a buffer of a
different size.

Fixes #1190
Reported-by: Alex Zepeda

On FreeBSD, uname is an inline function.  The uname that is present in
libc.so is for FreeBSD 1.0 compatibility.  It expects a buffer of a
different size.

Fixes #1190
Reported-by: Alex Zepeda

Bump version to 0.2.46

New release required for https://github.com/rust-lang/rust/pull/57121

Test out new bors integration

See if it works with Cirrus CI!

See if it works with Cirrus CI!

[skip ci] Add a Cirrus-ci.com build badge

Add IP_RECVDSTADDR on netbsd.

Accidentally left out IP_RECVDSTADDR on NetBSD in #1184

Reported-by: Alex Zepeda

Add IP_RECVIF to BSD and IP_RECVDSTADDR to apple.

FreeBSD/OpenBSD do not support IP_PKTINFO for IPv4 but use IP_RECVIF for interface index and IP_RECVDSTADDR for destination address.
NetBSD and macOS also support IP_RECVIF and IP_RECVDSTADDR in addition to IP_PKTINFO.
(For IPv6, all use IPV6_PKTINFO)

Define missing F_RDLCK, F_WRLCK and F_UNLCK constants on linux-mips -and s390x

These are defined in the fcntl.h glibc header on MIPS and s390x
systems on Linux but missing in the libc crate, so add them as they
are required for the file locking API in rustc.

These are defined in the fcntl.h glibc header on s390x systems
on Linux but missing in the libc crate, so add them as they are
required for the file locking API in rustc.

These are defined in the fcntl.h glibc header on MIPS systems
on Linux but missing in the libc crate, so add them as they are
required for the file locking API in rustc.

make tm struct members public

This PR makes the members of `struct tm` public.

I see no reason why these fields should not be public fields. They are public in the other targets. I did a blame and it seems that they have been private since added a couple years ago.

https://github.com/rust-lang/libc/commit/53e0d387f8765e9faa1ea921450167bb7f0b31ff

add some socket functions and a SOCKET type for windows

This PR adds a few of the socket functions for windows. Some targets use the `stdcall` calling convention for these functions, so I put them in an `extern "system"` block ([see the nomicon](https://doc.rust-lang.org/nomicon/ffi.html#foreign-calling-conventions)).

Expose unix ECN-related constants

I'm not certain of the correctness of the BSD definition, but I assume that's what CI's for.