First attempt at a Google Play feature graphic

These are required for new APK uploads or store listing changes, so
let's toss something simple together for now and revisit later.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
external: Update stoken to v0.81

This allows us to drop tomcrypt and link against nettle instead.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
external: Update openconnect to v7.02+

This also provides the run_pie binary for running curl on ICS, bumps NDK
to r10d, gets rid of the GCCVER override, and pulls in the latest GnuTLS.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
OpenConnectManagementThread: Use new Java API to get peer cert

getCertSHA1() has been replaced by getPeerCertHash().

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Don't store prebuilt binaries in git

These are getting updated too often and bloating the repo.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Add .gitignore files for binraies under libs/ and assets/raw/

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
external: Build curl binary with -pie

We will use the run_pie helper from Chromium/OpenConnect to execute it
on ICS.  JB+ can run PIE binaries without a helper.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
travis: Update to use NDK r10d; don't delete jar/so files

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>