As of 4.9.2, gcc started passing -fno-lto to collect2, or to ld if co…

…llect2 cannot be found. The latter is the case for our bundles, because we don't include collect2. Unfortunately, ld does not understand this option and errors out.

On the bright side, -fno-use-linker-plugin still works to suppress gcc's LTO, so we can drop -fno-lto.

src/librustc/back/link.rs

@@ -890,9 +890,6 @@ fn link_args(cmd: &mut Command,
         cmd.arg(obj_filename.with_extension("metadata.o"));
     }
 
-    // Rust does its' own LTO
-    cmd.arg("-fno-lto");
-
     if t.options.is_like_osx {
         // The dead_strip option to the linker specifies that functions and data
         // unreachable by the entry point will be removed. This is quite useful