LDC 1.40.0-beta5

[kinke]

Glad to announce the 5th beta for LDC 1.40. Major changes (since 
v1.39):

* Based on D ~2.110.0 (yesterday's upstream stable).
* Support for LLVM 19; the prebuilt packages use v19.1.3 (incl. 
macOS arm64).
* Support for Objective-C classes and protocols, as well as swift 
stub classes (via the `@swift` UDA).
* 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-beta5

Please help test, and thanks to all contributors & sponsors!