Fix to properly build emt in build-all, but only once during fresh checkouts...

Fix to properly build emt in build-all, but only once during fresh checkouts (as otherwise it's way too slow).  Re-release of broken package.  Fix to p1 to deal with doubling the size of huge stack frames (only does it above 32kb now).  Fix to VGT to mimic the input packages atd.class setting perfectly (omitted if omitted in the input package).  enabled polls for AWS.

Former-commit-id: 325eadd093e44d23538fd6a639ff187f80ee72d7