Bug 1040945 - Part 1: Install Android native libraries directly into lib/ANDROID_CPU_ARCH. r=glandium

This is a little tricky only because MOZ_CHILD_PROCESS_NAME is
"lib/libplugin-container.so" on Android, which meant special handling
at multiple places in the tree. This patch reduces the number of such
places.
Bug 1040945 - Part 2: Copy native libraries by name in AndroidEclipse backend make target. r=rnewman