Auto merge of #1374 - gnzlbg:cleanup_asmjs, r=gnzlbg

Cleanup asmjs

.travis.yml

@@ -233,8 +233,6 @@ matrix:
 
 
   allow_failures:
-      # FIXME: https://github.com/rust-lang/libc/issues/1226
-      - env: TARGET=asmjs-unknown-emscripten
       - name: "Semver Linux"
       - name: "Semver MacOSX"
 

Cargo.toml

 [package]
 name = "libc"
-version = "0.2.55"
+version = "0.2.56"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"