Use soong_zip instead of jar to generate .jar files in javac actions

This is to make the jar-output deterministic so that we can get
cache-hits for r8/d8 actions from RBE.

Change-Id: I911ee702fa5dabfe7122e82b21f78c811a0c960d
Test: m droid checkbuild

core/java.mk

@@ -296,6 +296,7 @@ $(full_classes_compiled_jar): \
     $(NORMALIZE_PATH) \
     $(JAR_ARGS) \
     $(ZIPSYNC) \
+    $(SOONG_ZIP) \
     | $(SOONG_JAVAC_WRAPPER)
 	@echo "Target Java: $@
 	$(call compile-java,$(TARGET_JAVAC),$(PRIVATE_ALL_JAVA_HEADER_LIBRARIES))