Remove ref to non-existent dir in xml-generator's Android.mk

Remove the reference to non-existent directory 'res/' in
cts-native-xml-generator's Android.mk, thus eliminating the
following build-time warning:
"line 0: cd: cts/tools/cts-native-xml-generator/src/res:
 No such file or directory"

Change-Id: Ic9ea59a8f85c10670b569751b304bd8bfa46fb0b
Signed-off-by: Ed Boraas <ed@boraas.ca>
diff --git a/tools/cts-native-xml-generator/src/Android.mk b/tools/cts-native-xml-generator/src/Android.mk
index 70b9f49..ed93457 100644
--- a/tools/cts-native-xml-generator/src/Android.mk
+++ b/tools/cts-native-xml-generator/src/Android.mk
@@ -20,7 +20,7 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := $(call all-subdir-java-files)
-LOCAL_JAVA_RESOURCE_DIRS := res
+LOCAL_JAVA_RESOURCE_DIRS := 
 LOCAL_JAR_MANIFEST := MANIFEST.mf
 
 LOCAL_MODULE := cts-native-xml-generator