Add test for linking non-existent static library

src/test/ui/feature-gate/feature-gate-static-nobundle-2.rs

@@ -0,0 +1,6 @@
+//~ ERROR kind="static-nobundle" is feature gated
+// Test the behavior of rustc when non-existent library is statically linked
+
+// compile-flags: -l static-nobundle=nonexistent
+
+fn main() {}

src/test/ui/feature-gate/feature-gate-static-nobundle-2.stderr

@@ -0,0 +1,7 @@
+error[E0658]: kind="static-nobundle" is feature gated (see issue #37403)
+   |
+   = help: add #![feature(static_nobundle)] to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.