Get CMake to support Android and iOS platforms

[LeventSevgili]

I always wanted to get CMake to support Android and iOS platforms. I had a little time window and managed to work it and I am happy to share. I will be super glad if it helps to someone!

It may have points to discuss. I'm glad to iterate. I had comments on files. Thanks!

[ANURAGX]

When this will be merged?

[corentin35000]

Just a note for the iOS package distribution, I see in the README, a dynamic library (.dylib) this has not been allowed for a long time on Apple stores, it is mandatory to have a static library: .a or .xcframework! I will soon post a github URL of one of my repositories, for :

• iOS/iPadOS (arm64)
• Android (arm64-v8a / armeabi-v7a)
• Linux (x64/arm64)
• Windows (x64/arm64)
• macOS (x64 /arm64)
• Steam Linux (x64 /arm64) via the Steam Linux Runtime 3.0 Sniper SDK
• Steam Deck (x64) via the Steam Runtime 3.0 Sniper SDK

Which will contain all the pre-compiled libraries in static form that you can retrieve via the artifacts of the Github Actions CI: protobuf + OpenSSL + GameNetworkingSockets, with obviously the latest version latest release of the libraries! I automated it from a CI so I would just have to change the tag / commitsha of protobuf (+absail) / openssl / GameNetworkingSockets, when I have the devkit for consoles I will also make the request to extend on consoles!