fix unknown symbol udivmoddi4

Author: mvolfik

compiler/rustc_target/src/spec/base/helenos.rs

@@ -5,6 +5,8 @@ pub(crate) fn opts() -> TargetOptions {
         os: "helenos".into(),
 
         dynamic_linking: true,
+        // we need the linker to keep libgcc and friends
+        no_default_libraries: false,
         has_rpath: true,
         relro_level: RelroLevel::Full,
         panic_strategy: PanicStrategy::Abort,