This patch eliminates the need for providing "xjavac", which saves building a
package for the unmaintained "xerces-tools".

Taken from https://anonscm.debian.org/viewvc/pkg-java/trunk/libxerces2-java/debian/patches/01_xjavac_taskdef.patch?revision=14507

Index: b/build.xml
===================================================================
--- a/build.xml
+++ b/build.xml
@@ -39,7 +39,7 @@
   <property name="tools.dir" value="./tools"/>
 
   <!-- enable compilation under JDK 1.4 and above -->
-  <taskdef name="xjavac" classname="org.apache.xerces.util.XJavac">
+  <taskdef name="xjavac" classname="org.apache.tools.ant.taskdefs.Javac">
     <classpath>
       <pathelement location="${tools.dir}/bin/xjavac.jar"/>
     </classpath>
@@ -291,7 +291,7 @@
            source="${javac.source}"
            target="${javac.target}"
            classpath="${build.dir}/classes:${tools.dir}/${jar.apis}:${tools.dir}/${jar.resolver}:${tools.dir}/${jar.serializer}"
-           debug="${debug}"
+           debug="${debug}" nowarn="true"
            debuglevel="${debuglevel}"
            deprecation="${deprecation}"
            optimize="${optimize}"
@@ -359,7 +359,7 @@
            source="${javac.source}"
            target="${javac.target}"
            classpath="${build.dir}/classes:${tools.dir}/${jar.apis}"
-           debug="${debug}"
+           debug="${debug}" nowarn="true"
            debuglevel="${debuglevel}"
            includeAntRuntime="false"
            includeJavaRuntime="true"/>
@@ -379,7 +379,7 @@
            source="${javac.source}"
            target="${javac.target}"
            classpath="${tools.dir}/${jar.apis}:${build.dir}/classes:./tools/junit.jar"
-           debug="${debug}"
+           debug="${debug}" nowarn="true"
            debuglevel="${debuglevel}"
            includeAntRuntime="false"
            includeJavaRuntime="true"/>
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<div class='path'>path: <a href='/guix/log/?id=a44569899a54d18a70b62498bec3774f0be3f66b'>root</a>/<a href='/guix/log/gnu?id=a44569899a54d18a70b62498bec3774f0be3f66b'>gnu</a>/<a href='/guix/log/gnu/packages?id=a44569899a54d18a70b62498bec3774f0be3f66b'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=a44569899a54d18a70b62498bec3774f0be3f66b'>patches</a>/<a href='/guix/log/gnu/packages/patches/webkitgtk-adjust-bubblewrap-paths.patch?id=a44569899a54d18a70b62498bec3774f0be3f66b'>webkitgtk-adjust-bubblewrap-paths.patch</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/patches/webkitgtk-adjust-bubblewrap-paths.patch?id=a44569899a54d18a70b62498bec3774f0be3f66b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-02-24 09:22:54 -0500'>2022-02-24</span></td><td><a href='/guix/commit/gnu/packages/patches/webkitgtk-adjust-bubblewrap-paths.patch?id=b9a4705f80e89fff3b65288cbbe8df73a365aee3'>gnu: webkitgtk: Adjust BubbleWrap wrapper.</a><span class='msg-avail'>...<span class='msg-tooltip'>This revisits &lt;https://issues.guix.gnu.org/40837&gt; with a fix that doesn't
require to have PULSE_CLIENTCONFIG point to an absolute store location, which
will allow us to revert to have PULSE_CLIENTCONFIG point to a fixed location
under /etc.  This would alleviate the need to reboot to have changes to the
PulseAudio configuration effected.

* gnu/packages/patches/webkitgtk-share-store.patch: Delete file.
* gnu/packages/patches/webkitgtk-bubblewrap-paths.patch: Add file.
* gnu/packages/patches/webkitgtk-canonicalize-paths.patch: Likewise.
* gnu/local.mk (dist_patch_DATA): Update patches list.
* gnu/packages/webkit.scm (webkitgtk)[patches]: Adjust accordingly.
</span></span></td><td>Maxim Cournoyer</td></tr>