Remove cfg-if dependency

This is to allow the crate to compile with rustc 1.13.

Author: tspiteri

Cargo.toml

@@ -10,5 +10,4 @@ maintenance = { status = "actively-developed" }
 keywords    = ["xdg", "basedir", "app_dirs", "path", "folder"]
 
 [dependencies]
-cfg-if = "=0.1.9"
 dirs-sys = "0.3.5"

src/lib.rs

@@ -13,26 +13,35 @@
 
 #![deny(missing_docs)]
 
-#[macro_use]
-extern crate cfg_if;
-
 use std::path::PathBuf;
 
-cfg_if! {
-    if #[cfg(target_os = "windows")] {
-        mod win;
-        use win as sys;
-    } else if #[cfg(any(target_os = "macos", target_os = "ios"))] {
-        mod mac;
-        use mac as sys;
-    } else if #[cfg(target_arch = "wasm32")] {
-        mod wasm;
-        use wasm as sys;
-    } else {
-        mod lin;
-        use lin as sys;
-    }
-}
+#[cfg(target_os = "windows")]
+mod win;
+#[cfg(target_os = "windows")]
+use win as sys;
+
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+mod mac;
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+use mac as sys;
+
+#[cfg(target_arch = "wasm32")]
+mod wasm;
+#[cfg(target_arch = "wasm32")]
+use wasm as sys;
+
+#[cfg(not(any(
+    target_os = "windows",
+    target_os = "macos", target_os = "ios",
+    target_arch = "wasm32"
+)))]
+mod lin;
+#[cfg(not(any(
+    target_os = "windows",
+    target_os = "macos", target_os = "ios",
+    target_arch = "wasm32"
+)))]
+use lin as sys;
 
 /// Returns the path to the user's home directory.
 ///