test

Add optional warnings for `windows-bindgen` to improve diagnostics (#… #3085

Job	Run time
check (stable, x86_64-pc-windows-msvc, x86_64-pc-windows-msvc)	22m 17s
check (nightly, x86_64-pc-windows-msvc, i686-pc-windows-msvc)	22m 17s
check (nightly, x86_64-pc-windows-gnu, x86_64-pc-windows-gnu)	25m 50s
check (stable, x86_64-pc-windows-gnu, i686-pc-windows-gnu)	24m 12s
check (stable, x86_64-pc-windows-msvc, aarch64-pc-windows-msvc, --no-run)	21m 14s
check (nightly, x86_64-pc-windows-msvc, aarch64-pc-windows-msvc, --no-run)	19m 58s
	2h 15m 48s

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