Tests

sync: Updated libR-sys with upstream #74

Job	Run time
ubuntu-latest w/ bindgen (R-devel rust-stable )	5m 12s
windows-latest (R-release rust-stable-msvc)	13m 34s
macOS-latest w/ bindgen (R-devel rust-stable )	8m 8s
windows-latest (R-devel rust-stable-msvc)	14m 34s
windows-latest w/ bindgen (R-release rust-stable-msvc x86_64-pc-windows-gnu)	5m 44s
windows-latest (R-oldrel rust-stable-msvc)	15m 47s
windows-latest w/ bindgen (R-devel rust-stable-msvc x86_64-pc-windows-gnu)	6m 45s
macOS-latest (R-release rust-stable)	11m 6s
windows-latest w/ bindgen (R-release rust-nightly-msvc x86_64-pc-windows-gnu)	8m 4s
ubuntu-latest (R-release rust-stable)	1m 13s
windows-latest w/ bindgen (R-oldrel rust-nightly-msvc x86_64-pc-windows-gnu)	13m 16s
ubuntu-latest (R-release rust-nightly)	6m 31s
ubuntu-latest (R-devel rust-stable)	7m 36s
ubuntu-latest (R-oldrel rust-stable)	6m 39s
	2h 4m 9s

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