libutils/libcutils: make host more like device

Having shared host libraries allows libraries depending on these to use
'shared_libs' for these. This simplifies configurations since these
libraries don't have to specify 'shared_libs' on all non-host targets.

Bug: 124524556
Test: build only

Change-Id: I09fb4a4fb66ea0a87cb76b1e6f400c537a11f082