[PATCH] Warning for main returning a bool.

[Joshua Hurwitz via cfe-commits]

See attached.

Returning a bool from main is a special case of return type mismatch. The
common convention when returning a bool is that 'true' (== 1) indicates
success and 'false' (== 0) failure. But since main expects a return value
of 0 on success, returning a bool is usually unintended.
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