Check the type of __wasm_call_ctors and __wasm_apply_data_relocs

[Lstarsky0]

The linker calls __wasm_call_ctors and __wasm_apply_data_relocs as [] -> [], but when it reads a library it only notes that they're exported. A library exporting one with a different type still links, and the problem shows up at the very end:

failed to validate component output
type mismatch for export `__wasm_call_ctors` of module instantiation argument `app.wasm`
expected: (func)
found:    (func (param i32))

or as an invalid component with --skip-validation. This checks both when the library is read, with the same message #2646 uses for the intrinsic imports:

failed to extract linking metadata from app.wasm: type mismatch for export `__wasm_call_ctors`: required linker ABI `[] -> []` but found `[I32] -> []`

_initialize and _start are called the same way, but a wrong type there is already caught when the encoder classifies the exports, so I left them alone.

The new error-link-ctors-signature test fails without the change.

Refs #2591