dirmngr: Workaround for a certain broken LDAP URL
* dirmngr/ldap.c (url_fetch_ldap): Detect and replace.
The actual URL causing this is
ldap://ldap.dgnservice.de:389/CN=CRL-1,O=DGN%20Service%20GmbH,\
C=DE?certificateRevocationList?base?objectClass=cRLDistributionPoint
It is actually not very helpful because I had problems finding the
issuer cert:
CN=dgnservice CRL2101 13:PN,O=DGN Deutsches Gesundheitsnetz \
Service GmbH,C=DE