Improvements to RenderScript support:

Improvements to RenderScript support:

- change dependency file location to be in the gen folder
  in the same package as the source file. This prevents collisions
  if there are two classes named the same in different packages
  or source folders.

- Now that the dependency files are visible, track their deletion
  and force recompilation if this happens

- Missing dependency files during generator initialization force
  a recompilation of the source file.

- Prevent packaging from taking .rs, .rsh, and .d files from the
  source folders. This also impacts the Ant build system.

Change-Id: Iede9193f67370e1784bd8ba661198bbf99238074