Fix syn-mid/METADATA am: 14797dc7e6 am: b8bb5abec1 am: cb3a17a730

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/syn-mid/+/1414040

Change-Id: I48018d37e72a2050c5b3a01b4c37652b2733bb8f