APU_USE_LIBXML2:
    Add LIBXML2_ICONV_INCLUDE_DIR and LIBXML2_ICONV_LIBRARIES
    settings to use with libxml2 builds that have a prereq on
    iconv().  (same settings as httpd)
    Remove the todo, since it works for me.
APU_HAVE_CRYPTO:
    Add missing doc.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1518206 13f79535-47bb-0310-9956-ffa450edef68