Don't build platform variants.

These depend on native_app_glue, which doesn't have a platform
variant.

Test: treehugger
Bug: 152482542
Change-Id: I5f3d9b27dc3911af6d96b77afd4aacef305f93f1
Merged-In: I5f3d9b27dc3911af6d96b77afd4aacef305f93f1
(cherry picked from commit 4184e3e7444186c1cd952b3c5d9ac3b14e1523c9)
2 files changed