auto merge of #14715 : vhbit/rust/ios-pr2, r=alexcrichton

src/libstd/dynamic_lib.rs

@@ -153,7 +153,7 @@ impl DynamicLibrary {
     }
 }
 
-#[cfg(test)]
+#[cfg(test, not(target_os = "ios"))]
 mod test {
     use super::*;
     use prelude::*;
@@ -206,6 +206,7 @@ mod test {
 #[cfg(target_os = "linux")]
 #[cfg(target_os = "android")]
 #[cfg(target_os = "macos")]
+#[cfg(target_os = "ios")]
 #[cfg(target_os = "freebsd")]
 pub mod dl {
     use prelude::*;