Auto merge of #29546 - alexcrichton:new-libc, r=brson

This commit replaces the in-tree liblibc with the [external clone](https://github.com/rust-lang-nursery/libc) which has no evolved beyond the in-tree version in light of its [recent redesign](https://github.com/rust-lang/rfcs/pull/1291).

The primary changes here are:

* `src/liblibc/lib.rs` was deleted
* `src/liblibc` is now a submodule pointing at the external repository
* `src/libstd/sys/unix/{c.rs,sync.rs}` were both deleted having all bindings folded into the external liblibc.
* Many ad-hoc `extern` blocks in the standard library were removed in favor of bindings now being in the external liblibc.
* Many functions/types were added to `src/libstd/sys/windows/c.rs`, and the scattered definitions throughout the standard library were consolidated here.

At the API level this commit is **not a breaking change**, although it is only very lightly tested on the *BSD variants and is probably going to break almost all of their builds! Follow-up commits to liblibc should in theory be all that's necessary to get the build working on the *BSDs again.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/libstd/sys/windows/printing/gnu.rs b/src/libstd/sys/windows/printing/gnu.rs
index e27bef0b1e9..c1367d5381d 100644
--- a/src/libstd/sys/windows/printing/gnu.rs
+++ b/src/libstd/sys/windows/printing/gnu.rs
@@ -11,14 +11,15 @@
 #![allow(deprecated)]
 
 use dynamic_lib::DynamicLibrary;
-use io;
 use io::prelude::*;
-use libc;
+use io;
+use sys::c;
+use libc::c_void;
 
 use sys_common::gnu::libbacktrace;
 
-pub fn print(w: &mut Write, i: isize, addr: u64, _: &DynamicLibrary, _: libc::HANDLE)
+pub fn print(w: &mut Write, i: isize, addr: u64, _: &DynamicLibrary, _: c::HANDLE)
         -> io::Result<()> {
-    let addr = addr as usize as *mut libc::c_void;
+    let addr = addr as usize as *mut c_void;
     libbacktrace::print(w, i, addr, addr)
 }