Use %pm in order to save 8k of stack in 'ap_pcfg_strerror'

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1563379 13f79535-47bb-0310-9956-ffa450edef68
s/apr_pstrndup/apr_pstrmemdup/ when applicable

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1563381 13f79535-47bb-0310-9956-ffa450edef68