Include stdsimd in rust-src component

[alexcrichton]

Closes #48734

[petrochenkov]

@bors r+

[bors]

📌 Commit 2f2ac9a has been approved by petrochenkov

[petrochenkov]

@bors p=3
Unbreaking no_std ecosystem.

[bors]

💡 This pull request was already approved, no need to approve it again.

• There's another pull request that is currently being tested, blocking this pull request: Update Cargo submodule #48549

[bors]

📌 Commit 2f2ac9a has been approved by 3

[bors]

⌛ Testing commit 2f2ac9a with merge e2746d8...

[bdrewery]

📌 Commit 2f2ac9a has been approved by 3

This seems weird?

[est31]

I guess @petrochenkov originally had sth like @bors r=3 and then edited their comment to read p=3. It can be fixed by doing @bors r=petrochenkov.

[bors]

@est31: 🔑 Insufficient privileges: Not in reviewers

[bors]

@est31: 🔑 Insufficient privileges: Not in reviewers

[est31]

aargh I thought that `` makes bors not parse it as a command. I was wrong. Sorry for the spam :).

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: 3
Pushing e2746d8 to master...