Expose libstatssocket as a stable C API

We create a .map.txt file that lists all the stable entry points into
libstatssocket. This should allow other APEXes to link to libstatssocket
without having to copy the library within the APEX.

Test: m -j libstatssocket
Bug: 146377784
Change-Id: I9f77a0c380b6884d9ca60807a8974380420cfe0a
diff --git a/libstats/socket/Android.bp b/libstats/socket/Android.bp
index 94c405d..3b6efbb 100644
--- a/libstats/socket/Android.bp
+++ b/libstats/socket/Android.bp
@@ -40,6 +40,14 @@
         "libcutils",
         "liblog",
     ],
+
+    // enumerate stable entry points for APEX use
+    stubs: {
+        symbol_file: "libstatssocket.map.txt",
+        versions: [
+            "1",
+        ],
+    }
 }
 
 cc_library_headers {