add '*.os' to .gitignore to exclude object files from builds

[MaxKablaam]

I'm building the Chodot plugin for the Godot game engine, and when I build on my mac with SCons, all the .os source files still show up in my changelists. This line fixed it right up.

[gewang]

what are the .os files and where are they produced? (typically .cpp and .c files builds into .o or .obj files)

[MaxKablaam]

Here are the files that I see when I build using SCons with macOS:

I checked and the compiler is using clang and clang++, so I'm actually not sure why the object files are .os.
According to CoPilot:

.os files are typically associated with object files generated by the OpenStep development environment, which was used for NeXTSTEP and macOS development. These files contain compiled code that is not yet linked into a final executable or library.

[MaxKablaam]

Maybe it has something to do with the godot-cpp module, which has it's own complex SCons environment. They have *.os in their git ignore:

    #.gitignore

# Godot auto generated files
*.gen.*
.import/
.godot/
/gen/

# Godot 3.x ignores
include/gen
src/gen

...

# Binaries
*.o
*.os
*.so
*.obj
*.bc
*.pyc
...