[2.12] profile backports from 2.13
Backport two profile fixes that made it into 2.13, but not into 2.12:
- dovecot/lmtp: allow dac_read_search
- Allow dovecot-lda to read anything under /usr/share/dovecot/protocols.d/.
Backport two profile fixes that made it into 2.13, but not into 2.12: