### 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 (brackets_open == 1) {
						args_start = i + 1;
						args_end = -1;
					}
				} else if (c == ')') {
					brackets_open--;
					if (brackets_open == 0) {
						args_end = i;
						add_argument = true;
						reached_end = true;
					}
				} else if (c == ',') {
					if (brackets_open == 1) {
						args_end = i;
						add_argument = true;
					}
				}
				if (add_argument) {
					if (args_start == -1 || args_end == -1) {
						set_error(RTR("Invalid macro argument list."), p_line_number);
						return false;
					}
					String arg = p_line.substr(args_start, args_end - args_start).strip_edges();
					if (arg.is_empty()) {
						set_error(RTR("Invalid macro argument."), p_line_number);
						return false;
					}
					args.append(arg);
					args_start = args_end + 1;
				}