Ticket 47543 - Mozldap - fix compiler warnings
    
    Fix these warnings:
    
    ../ds/ldap/servers/slapd/util.c: In function 'filter_stuff_func':
    ../ds/ldap/servers/slapd/util.c:257: warning: unused variable 'raw_filter'
    ../ds/ldap/servers/slapd/util.c:256: warning: unused variable 'escaped_filter'
    ../ds/ldap/servers/slapd/util.c: In function 'slapi_escape_filter_value':
    ../ds/ldap/servers/slapd/util.c:450: warning: unused variable 'raw_filter'
    ../ds/ldap/servers/slapd/util.c:449: warning: unused variable 'escaped_filter'
    ../ds/ldap/servers/plugins/posix-winsync/posix-winsync.c: In function 'sync_acct_disable':
    ../ds/ldap/servers/plugins/posix-winsync/posix-winsync.c:313: warning: implicit declaration of function 'strlen'
    ../ds/ldap/servers/plugins/posix-winsync/posix-winsync.c:313: warning: incompatible implicit declaration of built-in function 'strlen'
    ../ds/ldap/servers/plugins/posix-winsync/posix-group-task.c: In function 'posix_group_fix_memberuid_callback':
    ../ds/ldap/servers/plugins/posix-winsync/posix-group-task.c:283: warning: implicit declaration of function 'strlen'
    ../ds/ldap/servers/plugins/posix-winsync/posix-group-task.c:283: warning: incompatible implicit declaration of built-in function 'strlen'
    ../ds/ldap/servers/plugins/posix-winsync/posix-group-task.c:356: warning: implicit declaration of function 'strncasecmp'
    
    https://fedorahosted.org/389/ticket/47543
    
    Reviewed by: richm(Thanks!)