Fix ICE when main is declared in an extern block
#86190
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Changes in #84401 to implement
imported_mainchanged how the crate entry point is found, and a declaredmainin anexternblock was detected erroneously. This was causing the ICE described in #86110.This PR adds a check for this case and emits an error instead. Previously a
maindeclaration in anexternblock was not detected as an entry point at all, so emitting an error shouldn't break anything that worked previously. In 1.52.1 stable this is demonstrated, with a`main` function not founderror.Fixes #86110