gnu: doxygen: Update to 1.8.15.

* gnu/packages/documentation.scm (doxygen): Update to 1.8.15.
* gnu/packages/patches/doxygen-test.patch: Update for upstream changes.

gnu/packages/documentation.scm

@@ -123,7 +123,7 @@ markup) can be customized and extended by the user.")
 (define-public doxygen
   (package
     (name "doxygen")
-    (version "1.8.14")
+    (version "1.8.15")
     (home-page "http://www.doxygen.nl/")
     (source (origin
              (method url-fetch)
@@ -134,7 +134,7 @@ markup) can be customized and extended by the user.")
                                        ".src.tar.gz")))
              (sha256
               (base32
-               "0kcxymbam9jwiyjwyvwdjj0h74lbb6c467szsipzbxjyfl17wxfi"))
+               "0p94b4yb6bk2dxzs5kyl82xxgq2qakgbx5yy3ssbbadncb20x75x"))
              (patches (search-patches "doxygen-test.patch"))))
     (build-system cmake-build-system)
     (native-inputs

gnu/packages/patches/doxygen-test.patch

@@ -5,14 +5,14 @@ test.
 diff -u -r doxygen-1.8.7.orig/testing/012/citelist.xml doxygen-1.8.7/testing/012/citelist.xml
 --- doxygen-1.8.7.orig/testing/012/citelist.xml	2014-04-24 23:43:34.000000000 +0200
 +++ doxygen-1.8.7/testing/012/citelist.xml	2014-04-24 23:49:43.000000000 +0200
-@@ -4,17 +4,6 @@
-     <compoundname>citelist</compoundname>
-     <title>Bibliography</title>
+@@ -6,17 +6,6 @@
+     <briefdescription>
+     </briefdescription>
      <detaileddescription>
 -      <para>
 -        <variablelist>
 -          <varlistentry>
--            <term><anchor id="_1CITEREF_knuth79"/>[1]</term>
+-            <term><anchor id="citelist_1CITEREF_knuth79"/>[1]</term>
 -          </varlistentry>
 -          <listitem>
 -            <para>Donald<nonbreakablespace/>E. Knuth. <emphasis>Tex and Metafont, New Directions in Typesetting</emphasis>. American Mathematical Society and Digital Press, Stanford, 1979.</para>