### 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 (comments_open != 0) {
		return comment_line_open;
	}
	return -1;
}
char32_t ShaderPreprocessor::CommentRemover::peek() const {
	if (index < code.size()) {
		return code[index];
	}
	return 0;
}
bool ShaderPreprocessor::CommentRemover::advance(char32_t p_what) {
	while (index < code.size()) {
		char32_t c = code[index++];
		if (c == '\n') {
			line++;
			stripped.push_back('\n');
		}
		if (c == p_what) {
			return true;
		}
	}
	return false;
}
String ShaderPreprocessor::CommentRemover::strip() {