Auto merge of #410 - kallisti5:master, r=alexcrichton

Add support for Haiku x86 and x86_64

* Rework of original patches from Niels Sascha Reedijk
  that include style and build fixes for libc master

Author: bors

README.md

@@ -132,4 +132,6 @@ The following may be supported, but are not guaranteed to always work:
   * `i686-unknown-freebsd`
   * [`x86_64-unknown-bitrig`](https://doc.rust-lang.org/libc/x86_64-unknown-bitrig/libc/)
   * [`x86_64-unknown-dragonfly`](https://doc.rust-lang.org/libc/x86_64-unknown-dragonfly/libc/)
+  * `i686-unknown-haiku`
+  * `x86_64-unknown-haiku`
   * [`x86_64-unknown-netbsd`](https://doc.rust-lang.org/libc/x86_64-unknown-netbsd/libc/)

src/unix/bsd/mod.rs

@@ -321,6 +321,8 @@ f! {
 }
 
 extern {
+    pub fn getifaddrs(ifap: *mut *mut ::ifaddrs) -> ::c_int;
+    pub fn freeifaddrs(ifa: *mut ::ifaddrs);
     pub fn setgroups(ngroups: ::c_int,
                      ptr: *const ::gid_t) -> ::c_int;
     pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;

src/unix/haiku/b32.rs

@@ -0,0 +1,5 @@
+pub type c_long = i32;
+pub type c_ulong = u32;
+
+// intentionally not public, only used for fd_set
+const ULONG_SIZE: usize = 32;

src/unix/haiku/b64.rs

@@ -0,0 +1,5 @@
+pub type c_ulong = u64;
+pub type c_long = i64;
+
+// intentionally not public, only used for fd_set
+const ULONG_SIZE: usize = 64;