one more Java 8 version bump

modules/thirdparty/xerces-patch/build.xml

diff --git a/modules/thirdparty/xerces-patch/build.xml b/modules/thirdparty/xerces-patch/build.xml
index e856af6..7dd18aa 100644
--- a/modules/thirdparty/xerces-patch/build.xml
+++ b/modules/thirdparty/xerces-patch/build.xml
@@ -34,7 +34,7 @@
     <property name="module.dir" value="."/>
     <property name="module.src" value="${module.dir}/src/java"/>
     <property name="module.classes" value="${module.dir}/classes"/>
-    <property name="javac.src" value="1.4"/>
+    <property name="javac.src" value="1.8"/>
     <property name="build.number" value=""/>
 
     <target name="main" depends="clean,dev" description="cleans and runs the full build"/>