Clean up `lib` imported data #5185

Job	Run time
extract-assets	1m 8s
build-macos (Debug, lle)	59s
build-windows (Debug, lle)	2m 32s
build-macos (Debug, custom)	56s
build-linux (clang, Debug, lle, x86_64)	1m 19s
build-windows (Debug, custom)	2m 27s
build-macos (RelWithDebInfo, lle)	51s
build-linux (clang, Debug, custom, x86_64)	1m 22s
build-windows (RelWithDebInfo, lle)	3m 17s
build-linux (clang, RelWithDebInfo, lle, x86_64)	1m 11s
build-macos (RelWithDebInfo, custom)	59s
build-windows (RelWithDebInfo, custom)	2m 54s
build-linux (clang, RelWithDebInfo, custom, x86_64)	1m 16s
build-linux (gcc, Debug, lle, x86_64)	1m 59s
build-linux (gcc, Debug, custom, x86_64)	1m 40s
build-linux (gcc, RelWithDebInfo, lle, x86_64)	1m 16s
build-linux (gcc, RelWithDebInfo, custom, x86_64)	1m 13s
	27m 19s

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