Add LOCAL_DEX_PREOPT := false to force the samples to build actual apks.
In addition, fix a couple of other small issues:
- TtsEngine didn't have the api level set properly.
- SimpleJNI used a non-ndk library and was using libc++.
Change-Id: I1fd7c187956eed4620049bb746f4d62babcd648a
SupportLeanbackDemos starts out with a fully functional app with a
BrowseFragment. Still need to add examples with cursors, hovercards,
and more.
Change-Id: I845d5b92c29a5585af7968b08e7daa11b2996f5a