Merge #928

928: Wrap libc::statfs r=asomers a=alesharik

Fix for [#926](#926)

Co-authored-by: alesharik <alesharikreserv@yandex.ru>

CHANGELOG.md

@@ -19,6 +19,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#1077](https://github.com/nix-rust/nix/pull/1077))
 - Minimum supported Rust version is now 1.25.0 
   ([#1035](https://github.com/nix-rust/nix/pull/1035))
+- Now functions `statfs()` and `fstatfs()` return result with `Statfs` wrapper
+  ([#928](https://github.com/nix-rust/nix/pull/928))
 
 ### Fixed
 ### Removed

src/sys/mod.rs

@@ -71,7 +71,14 @@ pub mod socket;
 
 pub mod stat;
 
-#[cfg(any(target_os = "android", target_os = "linux", target_os = "macos"))]
+#[cfg(any(target_os = "android",
+          target_os = "dragonfly",
+          target_os = "freebsd",
+          target_os = "ios",
+          target_os = "linux",
+          target_os = "macos",
+          target_os = "openbsd"
+))]
 pub mod statfs;
 
 pub mod statvfs;