Don't include .git when copying defaults

Fixes issue 3409

Change-Id: I8ec4f554ce13cb0d6c39b24663ed34ca872cf57e
Reviewed-on: http://gerrit.dmdirc.com/273
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>
Tested-by: Gregory Holmes <greboid@dmdirc.com>

build-versioning.xml

@@ -66,7 +66,7 @@ identity:
     <target name="-copy-identities">
         <mkdir dir="${defaults.output}"/>
         <copy todir="${defaults.output}" overwrite="true">
-            <fileset dir="modules/defaults/"/>
+            <fileset dir="modules/defaults/" excludes=".git/"/>
         </copy>
     </target>