Merge r1703248, r1827366 from trunk:

core: Avoid a compiler warning when NO_LINGCLOSE is used (-Wunreachable-code).
Also, check c->aborted before apr_socket_shutdown() because it is set earlier,
and there is no point in calling shutdown() before close().


mod_ldap: fix format warnings.


Submitted by: ylavic
Reviewed by: jailletc36, jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1832491 13f79535-47bb-0310-9956-ffa450edef68