Move rustls-libssl/ to the repo root #264

Job	Run time
Clang Tidy	8s
Clippy	25s
Build+test (stable, ubuntu-24.04)	1m 45s
Clippy nightly (optional)	32s
Build+test (stable, ubuntu-22.04)	1m 37s
Check for documentation errors	46s
Build+test (beta, ubuntu-24.04)	1m 47s
Build+test (beta, ubuntu-22.04)	1m 54s
Format	5s
Miri	1m 7s
Build+test (nightly, ubuntu-24.04)	1m 46s
Build+test (nightly, ubuntu-22.04)	1m 42s
Packaging	3m 12s
Produce release packages (fedora, 40, rpm)	2m 57s
Valgrind	2m 25s
Produce release packages (ubuntu, 24.04, deb)	2m 25s
	24m 33s

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