Move the library to vendor partition

Both generic AOSP system image and vendor image might need libcurl,
so mark it as vendor_available.

Bug: 37117855
Test: Build it with "vendor_available: true," and check on Sailfish.
Change-Id: I8eee9093c8138e76094eb6d7f3f0b0e8f198ea75
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,