cmd/llgo-dist: Build packages listed by "go list std".

Keeps a "badPackages" list with a issue number reference on all packages
that currently do not build.

Dummy .ll files added to various packages just to get those packages building.
cmd/llgo-dist: Remove TODO comment regarding go list std ;)
Merge pull request #74 from quarnster/master

cmd/llgo-dist: Build packages listed by "go list std".