Closes #2538
Supercedes #2579
Follows my recommendation: #2579 (comment)
Current choice: Opt-Out (current commit)
Override via cfg(serde_derive_build = "source") to build from source
Alterative: Op...
The precompiled implementation is the only supported way to use the macros that are published in serde_derive. If there is implementation work needed in some build tools to accommodate it, someone should feel free to do that work