Load missing functions at runtime #490

Job	Run time
test-linux-lts (stable, false)	1m 30s
test-linux (stable, false)	1m 39s
test-windows-gnu (stable-x86_64-pc-windows-gnu, false)	3m 17s
test-macos (stable, false)	1m 27s
test-linux (beta, false)	1m 47s
test-windows-gnu (beta-x86_64-pc-windows-gnu, false)	3m 16s
test-windows-gnu-lts (stable-x86_64-pc-windows-gnu, false)	10m 9s
test-linux (nightly, true)	1m 37s
test-windows-gnu (nightly-x86_64-pc-windows-gnu, true)	3m 16s
test-macos (beta, false)	1m 32s
test-macos (nightly, true)	2m 8s
test-windows-msvc (stable-x86_64-pc-windows-msvc, false)	3m 53s
test-windows-msvc-lts (stable-x86_64-pc-windows-msvc, false)	10m 59s
test-windows-msvc (beta-x86_64-pc-windows-msvc, false)	3m 5s
test-windows-msvc (nightly-x86_64-pc-windows-msvc, true)	3m 3s
docs	21s
julia-module-test-linux	35s
julia-module-test-macos	38s
julia-module-test-windows-gnu	1m 42s
	55m 54s

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