aarch64 iOS simulator support

[simlay]

With m1 macs, the iOS simulator can run programs/libraries compiled to aarch64-apple-ios-sim. I saw in #1578, openssl-src was downgraded to 1.1.1 - this fixed a different build issue I had.

Anyway, as of alexcrichton/openssl-src-rs#131, openssl-src has support for aarch64-apple-ios-sim but this is only for cargo releases on openssl-src-300xxx.

I'll admit that I don't know what the best fix is here. On the one hand, it seems that there's issues with OpenSSL 3 as mentioned #1578 (comment).

Maybe I should make the case for publishing the changes in alexcrichton/openssl-src-rs#131 published to crates.io on the 111 release.

Having looked into it in alexcrichton/openssl-src-rs#135, this task may need to wait until OpenSSL 3.