add *.so and *.dll to gitignore

[crwedman]

These files become a nuisance when using godot-sqlite as a git submodule and building for Windows and Android. I don't want to have to move, delete or rebuild the files when I'm ready to check in sources in the parent git repository.

[2shady4u]

Hello @crwedman,

Sorry for the delay :(
Good idea to add this :)

Some small comments:

1. For completeness sake we should also add the other extensions to the .gitignore-file: framework, xcframework and wasm
2. Would be better to put these extensions in a different/new section in the .gitignore-file as it is important that these ignores are not (accidently) copied to the assetlib branch's .gitignore-file.

[crwedman]

Right. I'll put your suggestions to task when I come back around with improvements/cleaning-up my own project and build system.