ifaddrs: add ifaddrs support for android

Support under bionic/android is the same as under Linux for what is exposed
by this code.

Author: posborne

CHANGELOG.md

@@ -20,6 +20,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 ### Fixed
+- Support for `ifaddrs` now present when building for Android.
+  ([#1077](https://github.com/nix-rust/nix/pull/1077))
 ### Removed
 
 ## [0.14.0] - 2019-05-21

src/ifaddrs.rs

@@ -32,7 +32,7 @@ pub struct InterfaceAddress {
 }
 
 cfg_if! {
-    if #[cfg(any(target_os = "emscripten", target_os = "fuchsia", target_os = "linux"))] {
+    if #[cfg(any(target_os = "android", target_os = "emscripten", target_os = "fuchsia", target_os = "linux"))] {
         fn get_ifu_from_sockaddr(info: &libc::ifaddrs) -> *const libc::sockaddr {
             info.ifa_ifu
         }

src/lib.rs

@@ -35,7 +35,8 @@ pub mod errno;
 pub mod features;
 pub mod fcntl;
 #[deny(missing_docs)]
-#[cfg(any(target_os = "dragonfly",
+#[cfg(any(target_os = "android",
+          target_os = "dragonfly",
           target_os = "freebsd",
           target_os = "ios",
           target_os = "linux",