Revert #46360, re-enable macOS dist images.

[kennytm]

This PR reverts #46360, which disabled all macOS dist images to workaround travis-ci/travis-ci#8821.

This PR should be merged as soon as the Travis bug has been fixed.

Closes #46357.

cc @rust-lang/infra

[rust-highfive]

r? @alexcrichton

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[kennytm]

@bors p=2

[kennytm]

@bors r+

travis-ci/travis-ci#8821 (comment)

[bors]

📌 Commit 6b5f430 has been approved by kennytm

[bors]

⌛ Testing commit 6b5f430 with merge cd19e5e...

[bors]

💔 Test failed - status-travis

[kennytm]

@bors retry

An Android test case segfaulted. I don't think it is caused by this PR.

[01:10:57] test net::tcp::tests::debug ... ok
[01:10:58] test net::tcp::tests::double_bind ... ok
[01:10:58] test net::tcp::tests::fast_rebind ... ok
[01:10:58] test net::tcp::tests::listen_localhost ... ok
[01:10:59] died due to signal 11
[01:10:59] �[m�[m�[31m�[1merror:�[m test failed, to rerun pass '--lib'
[01:10:59] 
[01:10:59] 
[01:10:59] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "arm-linux-androideabi" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind jemalloc backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "std:0.0.0" "-p" "unwind:0.0.0" "-p" "compiler_builtins:0.0.0" "-p" "alloc:0.0.0" "-p" "alloc_system:0.0.0" "-p" "std_unicode:0.0.0" "-p" "libc:0.0.0" "-p" "panic_abort:0.0.0" "-p" "core:0.0.0" "--"
[01:10:59] expected success, got: exit code: 3
[01:10:59] 
[01:10:59] 
[01:10:59] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --target arm-linux-androideabi
[01:10:59] Build completed unsuccessfully in 1:08:10

[bors]

⌛ Testing commit 6b5f430 with merge 29de30d8e7e98611429d7dbc117f9eefd50762c9...

[bors]

💔 Test failed - status-appveyor

[kennytm]

@bors retry — 3 hour timeout.

It spent >30 minutes in compiling stage1-rustc and also >30 minutes in running run-pass tests. Something regressed the 32-bit performance a lot.

[bors]

⌛ Testing commit 6b5f430 with merge 78fcf33...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: kennytm
Pushing 78fcf33 to master...