Support host platform cc builds

This involves handling of linux-* platforms (identifying them
appropriately as host), disabling unsupported Windows platform, and
denylisting of still-problematic modules.

Test: mixed_droid, with verification that shared library artifacts
originate from bazel-out

Change-Id: Ib52db49a2d2a3c1ff9b76af23fd4f22cfc9182d0