rlottie: Switch to CMake

[OPNA2608]

Description of changes

I've encountered a project which tries to use rlottie's CMake module, which appears to be missing:

CMake Error at CMakeLists.txt:22 (find_package):
  By not providing "Findrlottie.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "rlottie", but
  CMake did not find one.

  Could not find a package configuration file provided by "rlottie" with any
  of the following names:

    rlottieConfig.cmake
    rlottie-config.cmake

  Add the installation prefix of "rlottie" to CMAKE_PREFIX_PATH or set
  "rlottie_DIR" to a directory containing one of the above files.  If
  "rlottie" provides a separate development package or SDK, be sure it has
  been installed.

The meson script has code for generating parts of the module, but it seems to be missing code for generating the targets file the config is expecting.

CMake Error at /nix/store/jh2j6l7yfmz1yqbvkdkj4b0rhq789gr4-rlottie-0.2/lib/cmake/rlottie/rlottieConfig.cmake:13 (include):
  include could not find requested file:

    /nix/store/jh2j6l7yfmz1yqbvkdkj4b0rhq789gr4-rlottie-0.2/lib/cmake/rlottie/rlottieTargets.cmake

↪ ll /nix/store/jh2j6l7yfmz1yqbvkdkj4b0rhq789gr4-rlottie-0.2/lib/cmake/rlottie/
insgesamt 8,0K
dr-xr-xr-x 2 root root   67  1. Jan 1970  .
dr-xr-xr-x 3 root root   21  1. Jan 1970  ..
-r--r--r-- 1 root root  546  1. Jan 1970  rlottieConfig.cmake
-r--r--r-- 1 root root 1,4K  1. Jan 1970  rlottieConfigVersion.cmake

The CMake config module only seems to be generated properly when using CMake. I lack the meson skills to know how one would solve this within the meson code, so I'd like to propose this switch to CMake.

Result works fine in some not-yet-upstreamed packages (rlottie-qml builds but has no binaries -> teleports uses it and works fine), nixpkgs-review rev HEAD passes & telegram-desktop at least launches fine.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

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[OPNA2608]

To test some rlottie users on CI:

@ofborg build lottieconverter lottieconverter.passthru.tests telegram-desktop telegram-desktop.passthru.tests

[SuperSandro2000]

LGTM