Fix argv.rs under the LLVM compiler. The call to rust_start was assuming that all rust main() functions have the same signature, but the compiler doesn't actually canonicalize them.  So instead just match the C signature of rust_start, and cast.
Fix argv.rs under the LLVM compiler.
The call to rust_start was assuming that all rust main() functions have the
same signature, but the compiler doesn't actually canonicalize them.  So
instead just match the C signature of rust_start, and cast.

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