[3.10] gh-114572: Fix locking in cert_store_stats and get_ca_certs (GH-114573) #115548
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cert_store_stats and get_ca_certs query the SSLContext's X509_STORE with
X509_STORE_get0_objects, but reading the result requires a lock. See
openssl/openssl#23224 for details.
Instead, use X509_STORE_get1_objects, newly added in that PR.
X509_STORE_get1_objects does not exist in current OpenSSLs, but we can
polyfill it with X509_STORE_lock and X509_STORE_unlock.
Work around const-correctness problem
Add missing X509_STORE_get1_objects failure check
Add blurb
(cherry picked from commit bce6931)
Co-authored-by: David Benjamin davidben@google.com