Solaris doesn't implement flock(), so any Rust implementation of flock()
will need to implement it using fcntl(), using the F_RDLCK, F_WRLCK, and
F_UNLCK constants.

Add memalign to Redox (for use in allocator)

This is required to satisfy a review item here: https://github.com/rust-lang/rust/pull/38401

Added AF_UNSPEC and several consts from netdb.h

Fix doc generation on travis.

Documentation generation appears to be failing on master (https://travis-ci.org/rust-lang/libc/jobs/183483333):

```
Collecting ghp-import
  Downloading ghp-import-0.4.1.tar.gz
Collecting travis
  Could not find a version that satisfies the requirement travis (from versions: )
No matching distribution found for travis
```

Basically `--user` doesn't appear to take an option, so `pip install ghp_import --user $USER` makes pip think the user is a package that needs to be installed (in this case `travis`). As there is no `travis` package, it dies.

Documentation generation appears to be failing on master (https://travis-ci.org/rust-lang/libc/jobs/183483333):

```
Collecting ghp-import
  Downloading ghp-import-0.4.1.tar.gz
Collecting travis
  Could not find a version that satisfies the requirement travis (from versions: )
No matching distribution found for travis
```

Basically `--user` doesn't appear to take an option, so `pip install ghp_import --user $USER` makes pip think the user is a package that needs to be installed (in this case `travis`). As there is no `travis` package, it dies.

Add clock_settime()

See http://www.catb.org/esr/time-programming/#_clock_gettime_2_clock_settime_2_clock_getres_2

See http://www.catb.org/esr/time-programming/#_clock_gettime_2_clock_settime_2_clock_getres_2

When checking the status from waitpid on a kill -STOP <child_pid> WIFSIGNALED returns true

Currently in WIFSIGNALED rust is doing:
(status & 0x7f) + 1
where status is i32

As defined in /usr/include/x86_64-linux-gnu/bits/waitstatus.h
#define __WIFSIGNALED(status) \
  (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)

Here is an example of the issue:
http://paste2.org/fXc8BxJ0

Run it, and it'll print the child pid then:
kill -STOP <child_pid>

Expect:
  Stopped by signal print statement
Results:
  Killed by signal print statement

Using the i32, it wont overflow leaving you with 128 returning true, using the waitstatus define you'll end up with -64 (since it shifts 1 right) which would return false. Though the C version shifts right once not really sure *why* but theres most likely a reason somewhere.

For the fix, just cast to i8 (signed char pretty much) as the C version is doing.

RUNNING ALL TESTS
PASSED 7356 tests

Add clearenv()

Add needed structs for fd passing

Dragonfly fixes 2016-12

This fixes libc again for DragonFly.

Recognize NetBSD/sparc64 as a generic 64-bit NetBSD

The union which contains a void* has to be aligned at a 8-byte boundary.

Keep them in the freebsdlike/mod.rs together with related constants.

Update both mips musl download locations

i686-unknown-openbsd libc correction

Now I had been able to run testsuite on i686-unknown-openbsd, here a batch of corrections.

- `suseconds_t` is `c_long` (`i64` or `i32` depending the arch)
- struct siginfo_t padding adjustment (the pointer `si_addr` makes the pad to change depending pointer size)

I tested the PR on i686-unknown-openbsd and x86_64-unknown-openbsd.