x509_vfy.c: refactor: improve some internal function names and add so… #1989

Job	Run time
basic_clang	5m 20s
basic_gcc	4m 47s
check_docs	1m 3s
check_update	1m 13s
check-ansi	2m 42s
address_ub_sanitizer	9m 55s
fuzz_tests	2m 57s
minimal	2m 21s
no-deprecated	4m 47s
non-caching	14m 31s
no-shared-macos	8m 40s
no-shared-ubuntu	3m 48s
self-hosted (freebsd-13.2)	1s
self-hosted (ubuntu-arm64-22.04)	1s
enable_non-default_options	3m 58s
external-test-cf-quiche	4m 1s
external-test-pyca (1.51.0, 3.9)	7m 33s
external-tests	11m 11s
full_featured	5m 35s
legacy	3m 55s
memory_sanitizer	19m 24s
no-legacy	4m 48s
out-of-readonly-source-and-install-macos	13m 38s
out-of-readonly-source-and-install-ubuntu	6m 40s
threads_sanitizer	5m 19s
	2h 28m 8s

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