Remove xdrlib #13617

Job	Run time
Ensure compilation on various targets	10m 25s
Run rust tests (macos-latest)	4m 4s
Check Rust code with rustfmt and clippy	2m 56s
Run rust tests (windows-latest)	14m 39s
Run rust tests (ubuntu-latest)	5m 44s
Run snippets and cpython tests (macos-latest)	13m 54s
Run snippets and cpython tests (windows-latest)	26m 8s
Run snippets and cpython tests (ubuntu-latest)	18m 31s
Run tests under miri	1m 20s
Check the WASM package and demo	4m 25s
Run snippets and cpython tests on wasm-wasi	1m 50s
	1h 43m 56s

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