Add the sdk_version that this should be built against.

Setting this enables our testing tools that must be SDK/NDK
compliant to include these static libs in their builds.

Bug: 74442448
Test: compile and CtsSkQPTestCases
Change-Id: I0dc742c6c177a99e662af171bd41f789cf51a48f

Android.bp

diff --git a/Android.bp b/Android.bp
index e5df946..4f16430 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,7 +1,5 @@
-cc_library_static {
-    name: "libjsoncpp",
-    vendor_available: true,
-    host_supported: true,
+cc_defaults {
+    name: "libjsoncpp_defaults",
 
     srcs: [
         "src/lib_json/json_reader.cpp",
@@ -27,3 +25,17 @@
         },
     },
 }
+
+cc_library_static {
+    name: "libjsoncpp",
+    defaults: ["libjsoncpp_defaults"],
+    vendor_available: true,
+    host_supported: true,
+}
+
+cc_library_static {
+    name: "libjsoncpp_ndk",
+    defaults: ["libjsoncpp_defaults"],
+    sdk_version: "9",
+    stl: "libc++_static",
+}