Support [*.metadata.rust-gpu.*] sections of Cargo.toml inside of build scripts

Author: tuguzT

crates/cargo-gpu-build/src/build.rs

@@ -1,10 +1,11 @@
 //! This module provides a `rust-gpu` shader crate builder
 //! usable inside of build scripts or as a part of CLI.
 
-use std::{io, process::Stdio};
+use std::{io, path::Path, process::Stdio};
 
 use crate::{
     lockfile::{LockfileMismatchError, LockfileMismatchHandler},
+    metadata::{RustGpuMetadata, RustGpuMetadataSource},
     spirv_builder::{CompileResult, SpirvBuilder, SpirvBuilderError},
     spirv_cache::{
         backend::{
@@ -88,6 +89,15 @@ pub struct CargoGpuMetadata {
     pub install: CargoGpuInstallMetadata,
 }
 
+impl RustGpuMetadata for CargoGpuMetadata {
+    #[inline]
+    fn patch<P>(&mut self, _shader_crate: P, _source: RustGpuMetadataSource<'_>)
+    where
+        P: AsRef<Path>,
+    {
+    }
+}
+
 /// Parameters for [`CargoGpuBuilder::new()`].
 #[derive(Debug, Clone)]
 #[non_exhaustive]