Disable duplicates warnings when merging jars

There are too many duplicates warnings, disable them until someone
is actually looking at them.

Bug: 69316739
Test: m checkbuild
Change-Id: Ifb67dbf7734b5f53941d110f578c4fe642e36005
diff --git a/core/java.mk b/core/java.mk
index 5945fae..f92cbca 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -517,7 +517,7 @@
                               $(full_static_java_libs) | $(MERGE_ZIPS)
 	$(if $(PRIVATE_JAR_MANIFEST), $(hide) sed -e "s/%BUILD_NUMBER%/$(BUILD_NUMBER_FROM_FILE)/" \
             $(PRIVATE_JAR_MANIFEST) > $(dir $@)/manifest.mf)
-	$(MERGE_ZIPS) -j $(if $(PRIVATE_JAR_MANIFEST),-m $(dir $@)/manifest.mf) \
+	$(MERGE_ZIPS) -j --ignore-duplicates $(if $(PRIVATE_JAR_MANIFEST),-m $(dir $@)/manifest.mf) \
             $(if $(PRIVATE_DONT_DELETE_JAR_META_INF),,-stripDir META-INF -zipToNotStrip $<) \
             $@ $< $(call reverse-list,$(PRIVATE_STATIC_JAVA_LIBRARIES))