Expose BN_set_flags as a no-op #4745

Job	Run time
grpc	29m 17s
haproxy	3m 21s
nmap	2m 18s
ntp	2m 3s
OpenLDAP	16m 54s
Python main	3m 44s
Python releases (FIPS=0 OPENSSL_IN_CRT=0)	13m 17s
socat	4m 48s
Python releases (FIPS=1 OPENSSL_IN_CRT=0)	12m 50s
tcpdump	1m 57s
tpm2-tss	3m 39s
trousers	1m 18s
Python releases (FIPS=0 OPENSSL_IN_CRT=1)	11m 39s
Python releases (FIPS=1 OPENSSL_IN_CRT=1)	12m 25s
amazon-corretto-crypto-provider	21m 41s
bind9	5m 2s
Cyrus-SASL	1m 6s
libevent	28m 47s
openvpn2-6	3m 42s
openvpnMaster	3m 49s
strongswan	1m 47s
	3h 5m 24s

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