Make libjsoncpp vendor_available.

Test: links with BOARD_VNDK_VERSION=current
Bug: 37342627
Change-Id: Id0444c12e33181c4db0d64e34a90880d7a15773f
diff --git a/Android.bp b/Android.bp
index 8240f6b..18198a0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,7 +1,6 @@
 cc_library_static {
-
     name: "libjsoncpp",
-
+    vendor_available: true,
     host_supported: true,
 
     srcs: [