Add libc++.so to bundle deps

Adds libc++.so to the list of data that's required for Android app
bundles. This is because bundles currently require aapt2, which in turn
requires libc++.so.

Bug: 950727
Change-Id: I4a198ae884e7a5ed8b1572dadf669018aecfdc04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600545
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657796}

build/config/android/rules.gni

@@ -4634,6 +4634,7 @@ if (enable_java_templates) {
       data = [
         _bundle_wrapper_script_path,
         _android_aapt2_path,
+        _android_aapt2_path + "/lib64/libc++.so",
         _keystore_path,
       ]
       data_deps = [