Remove nacl from librustc_back

Author: est31

src/librustc_back/target/le32_unknown_nacl.rs

@@ -215,7 +215,6 @@ supported_targets! {
     ("i686-pc-windows-msvc", i686_pc_windows_msvc),
     ("i586-pc-windows-msvc", i586_pc_windows_msvc),
 
-    ("le32-unknown-nacl", le32_unknown_nacl),
     ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
     ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
     ("wasm32-experimental-emscripten", wasm32_experimental_emscripten),