www/apache24: update to 2.4.46

Update apache24 to 2.4.46 (Apache HTTPD 2.4.46).  It fixes several
security problems:

CVE-2020-9490: Push Diary Crash on Specifically Crafted HTTP/2 Header
CVE-2020-11984: mod_uwsgi buffer overlow
CVE-2020-11985: CWE-345: Insufficient verification of data authenticity
CVE-2020-11993: Push Diary Crash on Specifically Crafted HTTP/2 Header

pkgsrc changes: reduce warnings by SUBST_* processing.

Changes with Apache 2.4.46
  *) mod_proxy_fcgi: Fix build warnings for Windows platform
    [Eric Covener, Christophe Jaillet]

Changes with Apache 2.4.45

  *) mod_http2: remove support for abandoned http-wg draft
    <https://datatracker.ietf.org/doc/draft-kazuho-h2-cache-digest/>.
    [Stefan Eissing]

Changes with Apache 2.4.44

  *) mod_proxy_uwsgi: Error out on HTTP header larger than 16K (hard
    protocol limit).  [Yann Ylavic]

  *) mod_http2:
    Fixes <https://github.com/icing/mod_h2/issues/200>:
    "LimitRequestFields 0" now disables the limit, as documented.
    Fixes <https://github.com/icing/mod_h2/issues/201>:
    Do not count repeated headers with same name against the field
    count limit. The are merged internally, as if sent in a single HTTP/1 line.
    [Stefan Eissing]

  *) mod_http2: Avoid segfaults in case of handling certain responses for
    already aborted connections.  [Stefan Eissing, Ruediger Pluem]

  *) mod_http2: The module now handles master/secondary connections and has marked
    methods according to use. [Stefan Eissing]

  *) core: Drop an invalid Last-Modified header value coming
    from a FCGI/CGI script instead of replacing it with Unix epoch.
    [Yann Ylavic, Luca Toscano]

  *) Add support for strict content-length parsing through addition of
    ap_parse_strict_length() [Yann Ylavic]

  *) mod_proxy_fcgi: ProxyFCGISetEnvIf unsets variables when expression
    evaluates to false.  PR64365. [Michael K旦nig <mail ikoenig.net>]

  *) mod_proxy_http: flush spooled request body in one go to avoid
    leaking (or long lived) temporary file. PR 64452. [Yann Ylavic]

  *) mod_ssl: Fix a race condition and possible crash when using a proxy client
    certificate (SSLProxyMachineCertificateFile).
    [Armin Abfalterer <a.abfalterer gmail.com>]

  *) mod_ssl: Fix memory leak in stapling code. PR63687. [Stefan Eissing]

  *) mod_http2: Fixed regression that no longer set H2_STREAM_ID and H2_STREAM_TAG.
    PR64330 [Stefan Eissing]

  *) mod_http2: Fixed regression that caused connections to close when mod_reqtimeout
    was configured with a handshake timeout. Fixes gitub issue #196.
    [Stefan Eissing]

  *) mod_proxy_http2: the "ping" proxy parameter
    (see <https://httpd.apache.org/docs/2.4/mod/mod_proxy.html>) is now used
    when checking the liveliness of a new or reused h2 connection to the backend.
    With short durations, this makes load-balancing more responsive. The module
    will hold back requests until ping conditions are met, using features of the
    HTTP/2 protocol alone. [Ruediger Pluem, Stefan Eissing]

  *) core: httpd is no longer linked against -lsystemd if mod_systemd
    is enabled (and built as a DSO).  [Rainer Jung]

  *) mod_proxy_http2: respect ProxyTimeout settings on backend connections
    while waiting on incoming data. [Ruediger Pluem, Stefan Eissing]

(taca)