Remove custom PKCS7 ASN1 functions, add new structs #3605

Job	Run time
amazon-corretto-crypto-provider	17m 38s
bind9	5m 7s
grpc	24m 8s
haproxy	3m 4s
libevent	28m 26s
ntp	2m 25s
OpenLDAP	16m 49s
openvpn	4m 22s
Python main	4m 16s
Python releases (FIPS=0 OPENSSL_IN_CRT=0)	14m 27s
socat	4m 43s
strongswan	1m 53s
tcpdump	1m 46s
Python releases (FIPS=1 OPENSSL_IN_CRT=0)	13m 1s
trousers	1m 19s
tpm2-tss	4m 1s
Python releases (FIPS=0 OPENSSL_IN_CRT=1)	11m 49s
Python releases (FIPS=1 OPENSSL_IN_CRT=1)	11m 52s
	2h 51m 6s

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