More emscripten test fixes

[tomaka]

r? @brson

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @brson (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[brson]

@bors r+

[bors]

📌 Commit 974ba28 has been approved by brson

[bors]

⌛ Testing commit 974ba28 with merge b70557a...

[bors]

💔 Test failed - auto-mac-64-opt

[alexcrichton]

@bors: retry

On Thu, Feb 11, 2016 at 2:22 PM, bors [email protected] wrote:

[image: 💔] Test failed - auto-mac-64-opt
http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/8011

—
Reply to this email directly or view it on GitHub
#31541 (comment).

[alexcrichton]

@bors: retry

[bors]

⌛ Testing commit 974ba28 with merge e7383b7...

[bors]

💔 Test failed - auto-mac-64-opt

[alexcrichton]

@bors: retry

On Thu, Feb 11, 2016 at 11:59 PM, bors [email protected] wrote:

[image: 💔] Test failed - auto-mac-64-opt
http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/8018

—
Reply to this email directly or view it on GitHub
#31541 (comment).

[bors]

⌛ Testing commit 974ba28 with merge 9257e89...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt