std: Clean out old unstable + deprecated APIs

[alexcrichton]

These should all have been deprecated for at least one cycle, so this commit
cleans them all out.

[rust-highfive]

r? @aturon

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[bors]

☔ The latest upstream changes (presumably #33927) made this pull request unmergeable. Please resolve the merge conflicts.

[aturon]

@bors: r+

[bors]

📌 Commit b64c9d5 has been approved by aturon

[bors]

⌛ Testing commit b64c9d5 with merge 7342880...

[alexcrichton]

@bors: retry force clean

• buildbot configuration bug

[bors]

⌛ Testing commit b64c9d5 with merge 0f39d1d...

[bors]

💔 Test failed - auto-linux-64-cross-armhf

[alexcrichton]

@bors: retry

On Tue, May 31, 2016 at 3:35 PM, bors notifications@github.com wrote:

💔 Test failed - auto-linux-64-cross-armhf
http://buildbot.rust-lang.org/builders/auto-linux-64-cross-armhf/builds/465

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[Manishearth]

Travis fails

[bors]

⌛ Testing commit b64c9d5 with merge 728eea7...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, 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-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild