LDC 1.40.0

[kinke]

Glad to announce LDC 1.40.0. Major changes:

* Based on D ~2.110.0 (today's upstream stable).
* Support for LLVM 19; the prebuilt packages use v19.1.3 (incl. 
macOS arm64). Thanks @liushuyu for the help!
* Support for Objective-C classes and protocols, as well as swift 
stub classes (via the `@swift` UDA). Thanks Adam and Luna!
* Emscripten: The compiler now mimicks a musl Linux platform wrt. 
extra predefined versions. ABI compatibility with clang improved 
too.
* Mainly for distro package maintainers: Use system zlib instead 
of Phobos' vendored version through CMake 
`-DPHOBOS_SYSTEM_ZLIB=ON`. Thanks Andrei!
* Edge-case fixes regarding IR struct layouts and link-time 
culling (for ELF targets).

Full release log and downloads:
https://github.com/ldc-developers/ldc/releases/tag/v1.40.0

Thanks to all contributors & sponsors!