X509: document non-standard behavior checking EKU extensions in CA an… #1532

Job	Run time
run-checker (no-cmp)	5m 9s
run-checker (no-cms)	5m 17s
run-checker (no-dgram)	4m 51s
run-checker (no-dh)	5m 9s
run-checker (no-dtls)	5m 16s
run-checker (no-ec)	5m 1s
run-checker (no-ecx)	5m 12s
run-checker (no-http)	5m 22s
run-checker (no-legacy)	5m 20s
run-checker (no-sock)	4m 40s
run-checker (enable-ssl-trace)	5m 23s
run-checker (no-stdio)	2m 17s
run-checker (no-threads)	5m 6s
run-checker (no-thread-pool)	5m 20s
run-checker (no-default-thread-pool)	5m 19s
run-checker (no-tls)	4m 50s
run-checker (no-tls1_2)	5m 9s
run-checker (no-tls1_3)	5m 47s
run-checker (enable-trace enable-fips)	5m 49s
run-checker (no-ui)	5m 21s
run-checker (no-quic)	5m 2s
	1h 46m 40s

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