Moved serv_ldap.h back into the main src dir as a temporary fix for a broken build...

Moved serv_ldap.h back into the main src dir as a temporary fix for a broken build when ldap enabled.
Thanks dothebart for pointing this out.
Seems there are hidden dependancies in serv_vcard so I had to reinsert the #include line there too.
This is a temporary measure and serv_ldap.h will move back into the module directory eventually.
To test this I had to install the latest OpenLDAP from the web site and have noted that several functions
we use are now deprecated to the point that they are no longer in <ldap.h> thus warnings are generated on
my build system.