Scons doesn't include render_server.hpp

### Godot version

4.6

### godot-cpp version

latest main

### System information

Arch

### Issue description

Using the template, cmake can see `` and compiles correctly with it included and referenced.

Scons however:
```
fatal error: godot_cpp/classes/rendering_server.hpp: No such file or directory
5 | #include
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
``` I'd like to be able to use the clangd plugin with scons but currently unable to due to this issue