apache-httpd: 2.4.38 -> 2.4.39 (CVE-2019-0211)

In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or
prefork, code executing in less-privileged child processes or
threads (including scripts executed by an in-process scripting interpreter)
could execute arbitrary code with the privileges of the parent process (usually
root) by manipulating the scoreboard.

(cherry picked from commit 2017158b53fefb67d5a02f6d02b72515d107256f)

pkgs/servers/http/apache-httpd/2.4.nix

···
 assert http2Support -> nghttp2 != null;
 
 stdenv.mkDerivation rec {
-  version = "2.4.38";
+  version = "2.4.39";
   name = "apache-httpd-${version}";
 
   src = fetchurl {
     url = "mirror://apache/httpd/httpd-${version}.tar.bz2";
-    sha256 = "0jiriyyf3pm6axf4mrz6c2z08yhs21hb4d23viq87jclm5bmiikx";
+    sha256 = "18ngvsjq65qxk3biggnkhkq8jlll9dsg9n3csra9p99sfw2rvjml";
   };
 
   # FIXME: -dev depends on -doc