Change api-versions.xml generator source order.

The generator now takes files first from prebuilts/tools
and then if not found takes them from prebuilds/sdk.

Change-Id: Ia099c26202292537e92eaaaa5c26ad2916114f1e
diff --git a/build/Android.mk b/build/Android.mk
index 2ba1f90..f8578d2 100644
--- a/build/Android.mk
+++ b/build/Android.mk
@@ -163,8 +163,8 @@
 $(HOST_OUT)/development/sdk/generated-api-versions.xml :
 	java -cp $(api_gen_classpath) \
 	  com.android.apigenerator.Main \
-	  --pattern $(TOPDIR)prebuilts/sdk/%/android.jar \
 	  --pattern $(TOPDIR)prebuilts/tools/common/api-versions/android-%/android.jar \
+	  --pattern $(TOPDIR)prebuilts/sdk/%/android.jar \
 	  $@