v0.6.0 shipped a win7/Server 2012 R2 installer whose dbx.exe statically
linked a WebView2 loader >= 1.0.1054.31 instead of the pinned 1.0.902.49,
failing on kernel 6.3 with ERROR_NOT_SUPPORTED. The loader patch rewrites
a file inside the cargo registry, which no compile cache can observe, so
the win7 release job stops using sccache until the loader is vendored,
and a binary audit now rejects any dbx.exe carrying post-1.0.902.49
loader strings.