fix(kernel): fast module loading fails on Windows (EPERM) #4212
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In #4181, a faster method to load modules was introduced: symlinking instead of recursing through the directory tree, mostly affecting the load times of large modules.
Since Windows Vista, non-Administrator users on Windows aren't allowed to create symlinks anymore, so this new loading method fails for users working in corporate Windows environments.
Catch the error and fall back to the slower copying method if that happens.
Fixes #4208.
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