Remove custom PKCS7 ASN1 functions, add new structs #3173

Job	Run time
grpc	23m 58s
amazon-corretto-crypto-provider	17m 47s
bind9	5m 11s
haproxy	3m 4s
ntp	2m 9s
libevent	27m 52s
OpenLDAP	17m 48s
openvpn	4m 49s
Python main	4m 40s
Python releases (FIPS=0 OPENSSL_IN_CRT=0)	12m 23s
socat	7m 54s
strongswan	1m 49s
Python releases (FIPS=1 OPENSSL_IN_CRT=0)	11m 49s
tcpdump	1m 45s
Python releases (FIPS=0 OPENSSL_IN_CRT=1)	12m 4s
tpm2-tss	3m 33s
trousers	1m 30s
Python releases (FIPS=1 OPENSSL_IN_CRT=1)	11m 43s
	2h 51m 48s

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