### 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)

clear_state();
	return err;
}
void ShaderPreprocessor::get_keyword_list(List<String> *r_keywords, bool p_include_shader_keywords, bool p_ignore_context_keywords) {
	r_keywords->push_back("define");
	if (!p_ignore_context_keywords) {
		r_keywords->push_back("defined");
	}
	r_keywords->push_back("elif");
	if (p_include_shader_keywords) {
		r_keywords->push_back("else");
	}
	r_keywords->push_back("endif");
	if (p_include_shader_keywords) {
		r_keywords->push_back("if");
	}
	r_keywords->push_back("ifdef");
	r_keywords->push_back("ifndef");
	r_keywords->push_back("include");
	r_keywords->push_back("pragma");
	r_keywords->push_back("undef");
}
void ShaderPreprocessor::get_pragma_list(List<String> *r_pragmas) {
	r_pragmas->push_back("disable_preprocessor");
}
ShaderPreprocessor::ShaderPreprocessor() {
}
ShaderPreprocessor::~ShaderPreprocessor() {
}