Add back no-op cranelift feature

Author: aumetra

packages/vm/Cargo.toml

@@ -31,6 +31,10 @@ stargate = ["cosmwasm-std/stargate"]
 # For heap profiling. Only used in the "heap_profiling" example.
 dhat-heap = ["dep:dhat"]
 
+# Legacy no-op feature. This is kept for compatibility with older contracts.
+# Delete this with the next major release.
+cranelift = []
+
 [lib]
 # See https://bheisler.github.io/criterion.rs/book/faq.html#cargo-bench-gives-unrecognized-option-errors-for-valid-command-line-options
 bench = false