cargo-c: use vendored source

srcpkgs/cargo-c/template

@@ -19,6 +19,14 @@ post_extract() {
 	cd ${wrksrc}
 	cp ${XBPS_SRCDISTDIR}/${pkgname}-${version}/Cargo.lock .
 	cargo vendor
+	mkdir -p .cargo
+	cat <<-EOF >>.cargo/config.toml
+	[source.crates-io]
+	replace-with = "vendored-sources"
+
+	[source.vendored-sources]
+	directory = "vendor"
+	EOF
 }
 
 post_install() {