upgrade openldap to fix gcc 4.4 build

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15941 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/directories/mod_ldap/Makefile

 BASE=../../../..
 
-LDAP=openldap-2.4.11
+LDAP=openldap-2.4.19
 LDAP_DIR=$(switch_srcdir)/libs/$(LDAP)
 LDAP_BUILDDIR=$(switch_builddir)/libs/$(LDAP)
 

src/mod/xml_int/mod_xml_ldap/Makefile

 BASE=../../../..
 
-LDAP=openldap-2.4.11
+LDAP=openldap-2.4.19
 LDAP_DIR=$(switch_srcdir)/libs/$(LDAP)
 LDAP_BUILDDIR=$(switch_builddir)/libs/$(LDAP)