gnu: mbedtls-apache: Update to 2.4.2 [fixes CVE-2017-2784, SLOTH and others].

See 'ChangeLog' in the source code distribution for more information about
security-related bug fixes.

* gnu/packages/tls.scm (mbedtls-apache): Update to 2.4.2.

gnu/packages/tls.scm

@@ -800,7 +800,7 @@ (define-public acme-client
 (define-public mbedtls-apache
   (package
     (name "mbedtls-apache")
-    (version "2.4.0")
+    (version "2.4.2")
     (source
      (origin
        (method url-fetch)
@@ -810,7 +810,7 @@ (define-public mbedtls-apache
                            version "-apache.tgz"))
        (sha256
         (base32
-         "03bzbfidigljva6xj49k38q3kwlbj75lrky4a0ainylzsfg5bhy1"))))
+         "065hn5zibzflivabdh9p41dknda7wicl2zhc936dmakqfjprip8p"))))
     (build-system cmake-build-system)
     (native-inputs
      `(("perl" ,perl)))