Silence API error for new constant in ConfigConstants

Change-Id: Ic4bd10b67caf6b2a2cc0c23bb4e7c717e4ccd6d5
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/.settings/.api_filters

@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <component id="org.eclipse.jgit" version="2">
+    <resource path="src/org/eclipse/jgit/lib/ConfigConstants.java" type="org.eclipse.jgit.lib.ConfigConstants">
+        <filter id="336658481">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.lib.ConfigConstants"/>
+                <message_argument value="CONFIG_KEY_REQUIRED"/>
+            </message_arguments>
+        </filter>
+    </resource>
     <resource path="src/org/eclipse/jgit/merge/ResolveMerger.java" type="org.eclipse.jgit.merge.ResolveMerger">
         <filter id="336658481">
             <message_arguments>