We must switch to OpenSSL 3.x, and getting lib/hcrypto to provide
OpenSSL 3.x APIs is too large an undertaking. Plus the hcrypto backend
is not safe, not secure (probably has timing leaks galore), and no one
has the resources to make it a world-class crypto library, so it just
has to go.
This makes it easier to install Heimdal and MIT kerberos on
the same system by just providing the heimdal-krb5.pc file;
the krb5.pc file is provided by both.
This is similar to what's done with heimdal-gssapi.pc/krb5-gssapi.pc.
Signed-off-by: Jelmer Vernooij <jelmer@samba.org>