feat: support fstat in linux

Author: hulxv

src/shims/unix/linux/foreign_items.rs

@@ -53,7 +53,11 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let result = this.linux_statx(dirfd, pathname, flags, mask, statxbuf)?;
                 this.write_scalar(result, dest)?;
             }
-
+            "fstat" => {
+                let [fd, buf] = this.check_shim_sig_lenient(abi, CanonAbi::C, link_name, args)?;
+                let result = this.fstat(fd, buf)?;
+                this.write_scalar(result, dest)?;
+            }
             // epoll, eventfd
             "epoll_create1" => {
                 let [flag] = this.check_shim_sig_lenient(abi, CanonAbi::C, link_name, args)?;