Build a release version of the library. To get these recipies, did what
I did before for the debug ones. Ran

    $ xcodebuild -scheme dome_key_event_source_simulator -configuration Release

and copy-pasted the result, with these changes:

* Removed "sysroot"-related arguments (for Rust integration)
* Changed absolute paths to use `${HOME}`
* Replaced DerivedData directory path hash with `*`

Instead of including Cocoa as a whole, include the specific frameworks
that the library depends on. `NSEvent` is in `AppKit` and `CGEvent` etc.
is in `CoreGraphics`.

I needed to remove the `-isysroot` compiler flag in order to get the
static library to build in my Rust project without the

    ld: framework not found ColorSync for architecture x86_64

linker error (which is apparently caused by the fact that I'm building
against a 10.13 SDK on a machine running 10.12, since ColorSync exists
only on 10.13).

Not sure if there's a way to have Xcode not use the `-isysroot` flag and
let us continue to build using `xcodebuild`.

Just copy-pasted the build output including exported environment
variables. I removed machine-specific things like absolute paths to my
home directory and the hash after the DerivedData directory.

Not very clean, but it seems to work.

Thanks to Xcode's analyser, I was finally clued into the fact that this
`CFRelease` was freeing a non-owned object, resulting in an extra free.
Remove this to resolve our memory management problems.

I'm getting a SIGTERM or segfault when running the library code from
Rust, so let's turn off ARC just in case and handle memory management
manually.