Do not allow asm.js and wasm32 emscripten targets to fail.

Closes #1226.

Author: gnzlbg

.travis.yml

@@ -209,9 +209,6 @@ matrix:
       # FIXME: android build bots time out irregularly
       - env: TARGET=aarch64-linux-android
       - env: TARGET=arm-linux-androideabi
-      # FIXME: https://github.com/rust-lang/libc/issues/1226
-      - env: TARGET=asmjs-unknown-emscripten
-      - env: TARGET=wasm32-unknown-emscripten
       - name: "Semver Linux"
       - name: "Semver MacOSX"