autotools: add missing android file to package

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=106779
Fixes: ff904978a1d299a36b587 "gallium/util: Android backtrace support"
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
1 file changed