Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Add support for Cryptographic Message Syntax (CMS)

It add CMS (RFC 5652) support, which is an update to PKCS7. The functions
are analogous BUT NOT IDENTICAL to openssl_pkcs7*. In parti

Add support for Cryptographic Message Syntax (CMS)

It add CMS (RFC 5652) support, which is an update to PKCS7. The functions
are analogous BUT NOT IDENTICAL to openssl_pkcs7*. In particular, support for
different encodings (PEM, DER, SMIME) is now available.

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