### 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)

bool is_cursor;
	String directive = p_tokenizer->get_identifier(&is_cursor, true);
	if (is_cursor) {
		state->completion_type = COMPLETION_TYPE_DIRECTIVE;
	}
	if (directive == "if") {
		process_if(p_tokenizer);
	} else if (directive == "ifdef") {
		process_ifdef(p_tokenizer);
	} else if (directive == "ifndef") {
		process_ifndef(p_tokenizer);
	} else if (directive == "elif") {
		process_elif(p_tokenizer);
	} else if (directive == "else") {
		process_else(p_tokenizer);
	} else if (directive == "endif") {
		process_endif(p_tokenizer);
	} else if (directive == "define") {
		process_define(p_tokenizer);
	} else if (directive == "undef") {
		process_undef(p_tokenizer);
	} else if (directive == "include") {
		process_include(p_tokenizer);
	} else if (directive == "pragma") {
		process_pragma(p_tokenizer);
	} else {
		set_error(RTR("Unknown directive."), p_tokenizer->get_line());
	}
}
void ShaderPreprocessor::process_define(Tokenizer *p_tokenizer) {