fix(c-api) Register errors from wasm_module_serialize

[Hywan]

This patch updates wasm_module_serialize to register errors withupdate_last_error if any.

[MarkMcCaskey]

Seems good, perhaps we want to write an "error" value out at out_ptr though, like all 0s.

Currently this can report errors but there's no easy way to check if this function errored because update_last_error is global and could have been set by something else

[Hywan]

Yes I know. The strategy for the other similar API is to keep the out parameter as is. Usually, the user passes a NULL value, so if NULL is still there, it's a sign for an error. The wasm.h doesn't precise anything about such behavior :-/.

[Hywan]

bors r+

[bors]

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