Add LDAP libraries to install script

Add LDAP dev package to Debian/Ubuntu install list.  Existed in Redhat already.  Merged from 11 to Trunk in 379643. Sorry for forgeting 1.8

(issue ASTERISK-20886)


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@379645 f38db490-d61c-443f-a65b-d21fe96a405b