Use generated `E_POINTER` constant in `windows-core` #2285

Job	Run time
check (stable, x86_64-pc-windows-msvc, x86_64-pc-windows-msvc)	17m 53s
check (nightly, x86_64-pc-windows-msvc, i686-pc-windows-msvc)	18m 40s
check (nightly, x86_64-pc-windows-gnu, x86_64-pc-windows-gnu)	23m 8s
check (stable, x86_64-pc-windows-gnu, i686-pc-windows-gnu)	22m 23s
check (stable, x86_64-pc-windows-msvc, aarch64-pc-windows-msvc, --no-run)	18m 54s
check (nightly, x86_64-pc-windows-msvc, aarch64-pc-windows-msvc, --no-run)	17m 41s
	1h 58m 39s

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