X509{,_LOOKUP}: Improve distinction between not found and fatal/internal error

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/14417)

doc/build.info

diff --git a/doc/build.info b/doc/build.info
index ea159c6..01ae209 100644
--- a/doc/build.info
+++ b/doc/build.info
@@ -2671,6 +2671,10 @@
 GENERATE[html/man3/X509_SIG_get0.html]=man3/X509_SIG_get0.pod
 DEPEND[man/man3/X509_SIG_get0.3]=man3/X509_SIG_get0.pod
 GENERATE[man/man3/X509_SIG_get0.3]=man3/X509_SIG_get0.pod
+DEPEND[html/man3/X509_STORE_CTX_get_by_subject.html]=man3/X509_STORE_CTX_get_by_subject.pod
+GENERATE[html/man3/X509_STORE_CTX_get_by_subject.html]=man3/X509_STORE_CTX_get_by_subject.pod
+DEPEND[man/man3/X509_STORE_CTX_get_by_subject.3]=man3/X509_STORE_CTX_get_by_subject.pod
+GENERATE[man/man3/X509_STORE_CTX_get_by_subject.3]=man3/X509_STORE_CTX_get_by_subject.pod
 DEPEND[html/man3/X509_STORE_CTX_get_error.html]=man3/X509_STORE_CTX_get_error.pod
 GENERATE[html/man3/X509_STORE_CTX_get_error.html]=man3/X509_STORE_CTX_get_error.pod
 DEPEND[man/man3/X509_STORE_CTX_get_error.3]=man3/X509_STORE_CTX_get_error.pod
@@ -3399,6 +3403,7 @@
 html/man3/X509_NAME_print_ex.html \
 html/man3/X509_PUBKEY_new.html \
 html/man3/X509_SIG_get0.html \
+html/man3/X509_STORE_CTX_get_by_subject.html \
 html/man3/X509_STORE_CTX_get_error.html \
 html/man3/X509_STORE_CTX_new.html \
 html/man3/X509_STORE_CTX_set_verify_cb.html \
@@ -3994,6 +3999,7 @@
 man/man3/X509_NAME_print_ex.3 \
 man/man3/X509_PUBKEY_new.3 \
 man/man3/X509_SIG_get0.3 \
+man/man3/X509_STORE_CTX_get_by_subject.3 \
 man/man3/X509_STORE_CTX_get_error.3 \
 man/man3/X509_STORE_CTX_new.3 \
 man/man3/X509_STORE_CTX_set_verify_cb.3 \