add libogc.gitignore (wii homebrew development)

[sctech-tr]

Reasons for making this change: as a dev who recently worked with libogc on wii projects, i’ve noticed that the existing .gitignore file for plain C is minimal and does not account for several common temporary system files generated during the build process, nor the compiled executable for the Wii. By creating a brand new .gitignore file just for libogc, this issue can be fixed. And wii homebrew development is not common, so it's in the community directory. that's all

Links to documentation supporting these rule changes: https://wiibrew.org/wiki/DevkitPPC https://wiibrew.org/wiki/Libogc not so good but it works

If this is a new template:

• Link to application or project’s homepage: https://github.com/devkitPro/libogc

let me know if you have any suggestions