Revert "install *.so in different paths for their types"

This reverts commit 842a985f. It's
causing test failures, warnings and complaints, so backing it out and
we'll resolve those before putting it back in.

This also bundles in the revert of a minor warning/error fixup for this
code, and does the correct thing with the CleanSpec.mk (which can't just
be reverted).

Bug: 33681361
Test: m -j
Change-Id: Ic889ce6a4737a497ad6bf633424ce1860713f7d0