### 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)

found_word = true;
			} else {
				_set_unexpected_token_error(s, p_line);
				return FAILED;
			}
		}
		if (word_completed) {
			if (open_bracket) {
				_set_expected_error(")", p_line);
				return FAILED;
			}
			if (post_bracket_index != -1) {
				index_end = post_bracket_index;
			}
			String body = state->defines.has(vector_to_string(text)) ? "true" : "false";
			String temp = result;
			result = result.substr(0, index) + body;
			index_start = result.length();
			if (index_end > 0) {
				result += temp.substr(index_end);
			}
		} else {
			set_error(RTR("Invalid macro name."), p_line);
			return FAILED;
		}
	}
	r_expanded = result;
	return OK;
}
Error ShaderPreprocessor::expand_macros(const String &p_string, int p_line, String &r_expanded) {