Fixes two issues:
1. Remove redundant check for hard-float in Teapot/MoreTeapots and ndk_helper
they depend. The ndk-build system add those flags already for armeabi-v7a-hard
2. native-audio in debug build: assert on the non-existance var
Change-Id: Id6b2d38a264c2f2d0e0c7fe625991fcee1762800