### 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)

break;
				} else if (!is_space) {
					_set_unexpected_token_error(s, p_line);
					return FAILED;
				}
			} else if (is_space) {
				if (found_word && !open_bracket) {
					index_end = i;
					word_completed = true;
				}
			} else if (c == '(') {
				if (open_bracket) {
					_set_unexpected_token_error(s, p_line);
					return FAILED;
				}
				open_bracket = true;
			} else if (c == ')') {
				if (open_bracket) {
					if (!found_word) {
						_set_unexpected_token_error(s, p_line);
						return FAILED;
					}
					open_bracket = false;
					post_bracket_index = i + 1;
				} else {
					index_end = i;
				}
				word_completed = true;
			} else if (is_char_word(c)) {
				text.push_back(c);