Import the changelog entries for 1.2.3 and 1.2.4 releases

from the APACHE_1_2_X branch of "apache" to the HEAD of "apachen".


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79008 13f79535-47bb-0310-9956-ffa450edef68