### 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)

int index = 0;
	int index_start = 0;
	int index_end = 0;
	while (find_match(result, "defined", index, index_start)) {
		bool open_bracket = false;
		bool found_word = false;
		bool word_completed = false;
		LocalVector<char32_t> text;
		int post_bracket_index = -1;
		int size = result.size();
		for (int i = (index_start - 1); i < size; i++) {
			char32_t c = result[i];
			if (c == 0) {
				if (found_word) {
					word_completed = true;
				}
				break;
			}
			char32_t cs[] = { c, '\0' };
			String s = String(cs);
			bool is_space = is_char_space(c);
			if (word_completed) {
				if (c == ')') {
					continue;
				}
				if (c == '|' || c == '&') {
					if (open_bracket) {
						_set_unexpected_token_error(s, p_line);
						return FAILED;
					}