Android binary size is very large

Currently even the simplest Swift android NDK bundle is almost 8mbs, compared to like 10k from the most trivial C* bundle. This is probably a barrier to adoption. We should look to see if there's any low hanging fruit we can fix.

cc @AttilaTheFun

Start by reproducing the simplest Swift Android NDK bundle and measuring its size against the trivial C bundle described in the issue. Investigate the build output to identify low-hanging sources of the roughly 8 MB size; done means documenting and addressing a concrete size reduction, with measurements showing the result.

Written by the indexing model from the issue text.