Add apple tvos support (#2169)

Cargo.toml

@@ -83,6 +83,9 @@ caps = "0.5.3"
 [target.'cfg(target_os = "freebsd")'.dev-dependencies]
 sysctl = "0.4"
 
+[build-dependencies]
+cfg_aliases = "0.1.1"
+
 [[test]]
 name = "test"
 path = "test/test.rs"

build.rs

@@ -0,0 +1,11 @@
+use cfg_aliases::cfg_aliases;
+
+fn main() {
+    cfg_aliases! {
+        ios: { target_os = "ios" },
+        macos: { target_os = "macos" },
+        watchos: { target_os = "watchos" },
+        tvos: { target_os = "tvos" },
+        apple_targets: { any(ios, macos, watchos, tvos) },
+    }
+}

src/dir.rs

@@ -230,10 +230,9 @@ impl Entry {
                          target_os = "fuchsia",
                          target_os = "haiku",
                          target_os = "illumos",
-                         target_os = "ios",
+                         apple_targets,
                          target_os = "l4re",
                          target_os = "linux",
-                         target_os = "macos",
                          target_os = "solaris"))] {
                 self.0.d_ino as u64
             } else {