rand: remove unimplemented librandom stub code #26074

Job	Run time
basic_clang	5m 54s
basic_gcc	5m 43s
check_docs	1m 3s
check_update	1m 14s
check-ansi	2m 34s
self-hosted (freebsd-13.2)	14m 5s
self-hosted (ubuntu-arm64-22.04)	10m 18s
address_ub_sanitizer	10m 43s
enable_non-default_options	4m 41s
full_featured	6m 14s
fuzz_tests	2m 55s
legacy	4m 44s
memory_sanitizer	21m 40s
minimal	2m 28s
no-deprecated	5m 12s
no-legacy	5m 53s
non-caching	15m 47s
no-shared-macos (macos-13)	12m 47s
no-shared-ubuntu	4m 22s
out-of-readonly-source-and-install-macos (macos-13)	12m 44s
no-shared-macos (macos-14)	3m 46s
out-of-readonly-source-and-install-ubuntu	7m 41s
out-of-readonly-source-and-install-macos (macos-14)	6m 39s
threads_sanitizer	5m 21s
external-test-cf-quiche	3m 47s
external-test-pyca (1.51.0, 3.9)	6m 37s
external-tests	11m 43s
	3h 16m 35s

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