[ag] Fix native build step with revised dockerfile

* PROBLEM:
  * most recent version (r14b) of `android-ndk` uses `clang` for cross-compilation
  * BUT: `openssl` cannot compile successfully w/ `clang`
  * AND: we depend on `openssl` transitively through `ics-openvpn`
    while trying to use `android-ndk` r14b

* FIX:
  * downgrade to `android-ndk` (12b) (most recent versoin that still
    uses `gcc` instead of `clang`)
  * modify some of the default

* REMAINING PROBLEMS:
  * some string translations for Jamaica now break the build (unclear
    why -- outdated country abbreviation? ja for jm???)
  * we are now using a version of ndk that is 2 versions old and a
    version of ics-openvpn (pinned to a 3.1.2016 commit via submodule)
    that depends on an outdated version of `openssl`, which raises
    security concerns. updating to the most recent version will force
    us to wade into all the dependency problems amongst `ics-openvpn`/`openssl`/`ndk`

* REFERENCES:
  * on `openssl` incompatibility w/ clang: https://github.com/openssl/openssl/pull/2229
  * on `ics-openvpn` problems with `ndk`: https://github.com/android-ndk/ndk/issues/144

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