### 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)

for (int i = 0; i < get_text_editor()->get_line_count(); i++) {
			get_text_editor()->set_line_background_color(i, Color(0, 0, 0, 0));
		}
		get_text_editor()->set_line_background_color(err_line - 1, marked_line_color);
		set_warning_count(0);
	} else {
		ShaderLanguage sl;
		sl.enable_warning_checking(saved_warnings_enabled);
		uint32_t flags = saved_warning_flags;
		if (shader.is_null()) {
			if (flags & ShaderWarning::UNUSED_CONSTANT) {
				flags &= ~(ShaderWarning::UNUSED_CONSTANT);
			}
			if (flags & ShaderWarning::UNUSED_FUNCTION) {
				flags &= ~(ShaderWarning::UNUSED_FUNCTION);
			}
			if (flags & ShaderWarning::UNUSED_STRUCT) {
				flags &= ~(ShaderWarning::UNUSED_STRUCT);
			}
			if (flags & ShaderWarning::UNUSED_UNIFORM) {
				flags &= ~(ShaderWarning::UNUSED_UNIFORM);
			}
			if (flags & ShaderWarning::UNUSED_VARYING) {
				flags &= ~(ShaderWarning::UNUSED_VARYING);
			}
		}
		sl.set_warning_flags(flags);
		ShaderLanguage::ShaderCompileInfo comp_info;
		comp_info.global_shader_uniform_type_func = _get_global_shader_uniform_type;
		if (shader.is_null()) {