Silence API errors for new methods added to BitmapBuilder

These API changes were introduced in f523f21e and 73474466.

BitmapBuilder is an interface to be implemented by implementors of this
interface. According to OSGi semantic versioning rules breaking API
changes require update of the minor version only if implementors of the
API have to be adapted and the changes do not affect clients of the API.

Change-Id: If45d204181ea9bc788b6b57693ca17b1847564c7
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/.settings/.api_filters

@@ -1,5 +1,19 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <component id="org.eclipse.jgit" version="2">
+    <resource path="src/org/eclipse/jgit/lib/BitmapIndex.java" type="org.eclipse.jgit.lib.BitmapIndex$BitmapBuilder">
+        <filter comment="interface is implemented by extenders but not clients of the API" id="403804204">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder"/>
+                <message_argument value="addObject(AnyObjectId, int)"/>
+            </message_arguments>
+        </filter>
+        <filter comment="interface is implemented by extenders but not clients of the API" id="403804204">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder"/>
+                <message_argument value="getBitmapIndex()"/>
+            </message_arguments>
+        </filter>
+    </resource>
     <resource path="src/org/eclipse/jgit/transport/PushCertificate.java" type="org.eclipse.jgit.transport.PushCertificate">
         <filter comment="PushCertificate wasn't really usable in 4.0" id="338722907">
             <message_arguments>