Add vendor_available:true for libcurl

Bug: 38244611
Test: build sailfish
Change-Id: Ib3ae539bafe8435c67983c999c241061af563d92
diff --git a/Android.bp b/Android.bp
index e10f423..7b79185 100644
--- a/Android.bp
+++ b/Android.bp
@@ -32,6 +32,7 @@
 
 cc_library {
     name: "libcurl",
+    vendor_available: true,
     defaults: ["curl_common_defaults"],
     export_include_dirs: ["include"],
     host_supported: true,