only error with +whole-archive,+bundle for rlibs

Fixes #110912

Checking `flavor == RlibFlavor::Normal` was accidentally lost in
601fc8b
#105601

That caused combining +whole-archive and +bundle link modifiers on
non-rlib crates to fail with a confusing error message saying that
combination is unstable for rlibs. In particular, this caused the
build to fail when +whole-archive was used on staticlib crates, even
though +whole-archive effectively does nothing on non-bin crates because
the final linker invocation is left to an external build system.

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -349,7 +349,10 @@ fn link_rlib<'a>(
         let NativeLibKind::Static { bundle: None | Some(true), whole_archive } = lib.kind else {
             continue;
         };
-        if whole_archive == Some(true) && !codegen_results.crate_info.feature_packed_bundled_libs {
+        if whole_archive == Some(true)
+            && flavor == RlibFlavor::Normal
+            && !codegen_results.crate_info.feature_packed_bundled_libs
+        {
             sess.emit_err(errors::IncompatibleLinkingModifiers);
         }
         if flavor == RlibFlavor::Normal && let Some(filename) = lib.filename {