fix: skip importing memfd and rustix if std feature is disabled
#12520
+5
−5
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We do not need to import
memfdandrustixcrates if we have disabled thestdfeature.This PR just excludes these packages on
fiberandwasmtimeifstdfeature is disabled.If we don't do this,
libstd.rmetawill be forcibly linked when building a package that links wasmtime in a#![no_std]environment.