Handle _initialize
non existence in wasi reactor modules
#70
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The
_initialize
export is optional and may not exist in a wasi reactor module, according to https://github.com/WebAssembly/WASI/blob/main/legacy/application-abi.md#current-unstable-abi. When it doesn't exist, simply don't do anything. This is especially useful in cases where a module has been pre-initialized bywizer
and the_initialize
export has been stripped.