cargo: patch zstd-sys to use system library

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

zstd-sys/src/lib.rs

@@ -0,0 +1,5 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));