Enable all function references spec tests (#8348)

These are all passing now that we support typed function references in the
embedder API and our `wasmparser` and `wast` deps have been updated to versions
that fix the issues referenced in the old comments.

build.rs

@@ -257,25 +257,6 @@ fn ignore(testsuite: &str, testname: &str, strategy: &str) -> bool {
         return true;
     }
 
-    if testsuite == "function_references" {
-        // The following tests fail due to function references not yet
-        // being exposed in the public API.
-        if testname == "ref_null" || testname == "local_init" {
-            return true;
-        }
-        // This test fails due to incomplete support for the various
-        // table/elem syntactic sugar in wasm-tools/wast.
-        if testname == "br_table" {
-            return true;
-        }
-        // This test fails due to the current implementation of type
-        // canonicalisation being broken as a result of
-        // #[derive(hash)] on WasmHeapType.
-        if testname == "type_equivalence" {
-            return true;
-        }
-    }
-
     if testsuite == "gc" {
         if [
             "array_copy",