Revert "workarounds to make link guards work on windows"

This reverts commit b52004d202ddfffa100d4963216e1673a0be0b95.

src/rtstartup/rsbegin.rs

@@ -23,20 +23,9 @@
 // of other runtime components (registered via yet another special image section).
 
 #![crate_type="rlib"]
-#![feature(no_core, lang_items, optin_builtin_traits)]
-#![no_core]
+#![no_std]
 #![allow(non_camel_case_types)]
 
-#[lang="sized"]
-trait Sized {}
-
-#[lang="copy"]
-trait Copy {}
-
-#[lang="sync"]
-trait Sync {}
-impl Sync for .. {}
-
 #[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
 pub mod eh_frames
 {

src/rtstartup/rsend.rs

@@ -11,12 +11,7 @@
 // See rsbegin.rs for details.
 
 #![crate_type="rlib"]
-#![feature(no_core, lang_items, optin_builtin_traits)]
-#![no_core]
-
-#[lang="sync"]
-trait Sync {}
-impl Sync for .. {}
+#![no_std]
 
 #[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
 pub mod eh_frames

src/test/run-pass/smallest-hello-world.rs

@@ -22,7 +22,7 @@ extern "rust-intrinsic" { fn transmute<T, U>(t: T) -> U; }
 
 #[lang = "eh_personality"] extern fn eh_personality() {}
 #[lang = "eh_unwind_resume"] extern fn eh_unwind_resume() {}
-#[lang = "panic_fmt"] extern fn panic_fmt() -> ! { loop {} }
+#[lang = "panic_fmt"] fn panic_fmt() -> ! { loop {} }
 #[no_mangle] pub extern fn rust_eh_register_frames () {}
 #[no_mangle] pub extern fn rust_eh_unregister_frames () {}