relax `new_with_extra_roots` API #805

Job	Run time
Clippy (-Zbuild-std)	34s
Clippy (stable) (ubuntu-latest)	1m 3s
Test (ubuntu-latest)	20s
Clippy (stable) (macos-latest)	27s
Test (macos-latest)	19s
Clippy (stable) (windows-latest)	1m 31s
Test (windows-latest)	1m 18s
Ktlint	33s
Clippy (MSRV) (ubuntu-latest)	3m 4s
Clippy (MSRV) (macos-latest)	1m 51s
Clippy (MSRV) (windows-latest)	2m 47s
Rustfmt	4s
Test (Android)	3m 31s
Test (FreeBSD)	3m 0s
Check for documentation errors	30s
Check semver compatibility	19s
Verify Android artifacts	1m 20s
	22m 31s

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