Update to 2.4.2

* Disable mod_proxy_html explicitly.

Changes with Apache 2.4.2

  *) SECURITY: CVE-2012-0883 (cve.mitre.org)
    envvars: Fix insecure handling of LD_LIBRARY_PATH that could lead to the
    current working directory to be searched for DSOs. [Stefan Fritsch]

  *) mod_slotmem_shm: Honor DefaultRuntimeDir [Jim Jagielski]

  *) mod_ssl: Fix crash with threaded MPMs due to race condition when
    initializing EC temporary keys. [Stefan Fritsch]

  *) mod_proxy: Add the forcerecovery balancer parameter that determines if
    recovery for balancer workers is enforced. [Ruediger Pluem]

  *) Fix MPM DSO load failure on AIX.  [Jeff Trawick]

  *) mod_proxy: Correctly set up reverse proxy worker. PR 52935.
    [Petter Berntsen <petterb gmail.com>]

  *) mod_sed: Don't define PATH_MAX to a potentially undefined value, causing
    compile problems on GNU hurd. [Stefan Fritsch]

  *) core: Add ap_runtime_dir_relative() and DefaultRuntimeDir.
    [Jeff Trawick]

  *) core: Fix breakage of Listen directives with MPMs that use a
    per-directory config. PR 52904. [Stefan Fritsch]

  *) core: Disallow directives in AllowOverrideList which are only allowed
    in VirtualHost or server context. These are usually not prepared to be
    called in .htaccess files. [Stefan Fritsch]

  *) core: In AllowOverrideList, do not allow 'None' together with other
    directives. PR 52823. [Stefan Fritsch]

  *) mod_slotmem_shm: Support DEFAULT_REL_RUNTIMEDIR for file-based shm.
    [Jim Jagielski]

  *) core: Fix merging of AllowOverrideList and ContentDigest.
    [Stefan Fritsch]

  *) mod_request: Fix validation of the KeptBodySize argument so it
    doesn't always throw a configuration error. PR 52981 [Eric Covener]

  *) core: Add filesystem paths to access denied / access failed messages
    AH00035 and AH00036. [Eric Covener]

  *) mod_dumpio: Properly handle errors from subsequent input filters.
    PR 52914. [Stefan Fritsch]

  *) Unix MPMs: Fix small memory leak in parent process if connect()
    failed when waking up children.  [Joe Orton]

  *) "DirectoryIndex disabled" now undoes DirectoryIndex settings in
    the current configuration section, not just previous config sections.
    PR 52845. [Eric Covener]

  *) mod_xml2enc: Fix broken handling of EOS buckets which could lead to
    response headers not being sent. PR 52766. [Stefan Fritsch]

  *) mod_ssl: Properly free the GENERAL_NAMEs. PR 32652. [Kaspar Brand]

  *) core: Check during config test that directories for the access
    logs actually exist. PR 29941. [Stefan Fritsch]

  *) mod_xml2enc, mod_proxy_html: Enable per-module loglevels.
    [Stefan Fritsch]

  *) mod_filter: Fix segfault with AddOutputFilterByType. PR 52755.
    [Stefan Fritsch]

  *) mod_session: Sessions are encoded as application/x-www-form-urlencoded
    strings, however we do not handle the encoding of spaces properly.
    Fixed. [Graham Leggett]

  *) Configuration: Example in comment should use a path consistent
    with the default configuration. PR 52715.
    [Rich Bowen, Jens Schleusener, Rainer Jung]

  *) Configuration: Switch documentation links from trunk to 2.4.
    [Rainer Jung]

  *) configure: Fix out of tree build using apr and apr-util in srclib.
    [Rainer Jung]

(ryoon)