### Godot version

v4.0.beta15.official [4fa6edc88]

### System information

Windows 10 (10.0.19045 Build 19045) | Forward+ | Vulkan API 1.3.206 | AMD Radeon RX 6800 XT

### Issue description

If there is a function with arguments within a `.gdshaderinc` file, then this function can not be used in other shaders that include this via a relative include. The error in the other shaders is "Too many arguments for "example()" call. Expected at most 0 but received 1". Using an absolute path for the include resolves the error.

**Note:** The relative include *does* work in the special case of both files being in the project root.

### Steps to reproduce

1. Put a shader and a shader-include file into a subdirectory
2. Write a function with arguments in the shader-include file
3. Include that file in the shader
4. Try to use the function

### Minimal reproduction project

[shader-include-bug.zip](https://github.com/godotengine/godot/files/10508745/shader-include-bug.zip)

if (state->error.is_empty()) {
		state->error = p_error;
		FilePosition fp;
		fp.line = p_line + 1;
		state->include_positions.push_back(fp);
	}
}
ShaderPreprocessor::Define *ShaderPreprocessor::create_define(const String &p_body) {
	ShaderPreprocessor::Define *define = memnew(Define);
	define->body = p_body;
	return define;
}
void ShaderPreprocessor::clear_state() {
	if (state != nullptr) {
		for (const RBMap<String, Define *>::Element *E = state->defines.front(); E; E = E->next()) {
			memdelete(E->get());
		}
		state->defines.clear();
	}
	state = nullptr;
}
Error ShaderPreprocessor::preprocess(State *p_state, const String &p_code, String &r_result) {
	output.clear();
	state = p_state;
	CommentRemover remover(p_code);
	String stripped = remover.strip();
	String error = remover.get_error();
	if (!error.is_empty()) {
		set_error(error, remover.get_error_line());