Only look for `main` at the crate level#6119

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brson wants to merge 3 commits intorust-lang:incomingfrom

Commits on Apr 29, 2013

rustc: Move code for discovering the crate entry point into its own pass
brson
committed

Commits on Apr 30, 2013

rustc: Only accept main functions at the crate level. #4433
brson
committed

Commits on May 8, 2013

rustc: Fix the logic for finding the Android main function
brson
committed