do not emit const_transmute in generated test main functions

Author: fw-immunant

scripts/test_translator.py

@@ -344,7 +344,6 @@ def run(self) -> List[TestOutcome]:
             "extern_types",
             "simd_ffi",
             "stdsimd",
-            "const_transmute",
             "nll",
             "linkage",
             "register_tool",