Use no-prefer-dynamic

Author: jonas-schievink

src/test/ui/lto-opt-level-s.rs

@@ -1,5 +1,6 @@
 // compile-flags: -Clinker-plugin-lto -Copt-level=s
 // build-pass
+// no-prefer-dynamic
 
 #![crate_type = "rlib"]
 

src/test/ui/lto-opt-level-z.rs

@@ -1,5 +1,6 @@
 // compile-flags: -Clinker-plugin-lto -Copt-level=z
 // build-pass
+// no-prefer-dynamic
 
 #![crate_type = "rlib"]