Compilation: several branch regression fixes

* move wasi_emulated_libs into Compilation
  - It needs to be accessed from Compilation, which needs to potentially
    build those artifacts.
* Compilation: improve error reporting for two cases
  - the setMiscFailure mechanism is handy - let's use it!
* fix one instance of incorrectly checking for emit_bin via
  `comp.bin_file != null`. There are more instances of this that need to
  be fixed in a future commit.
* fix renameTmpIntoCache not handling the case where it needs to make
  the "o" directory in the zig-cache directory.
  - while I'm at it, simplify the logic for handling the fact that
    Windows returns error.AccessDenied rather than
    error.PathAlreadyExists for failure to rename a directory over
    another one.
* fix missing cache hash additions
  - there are still more to add in a future commit -
    addNonIncrementalStuffToCacheManifest is called when bin_file is
    always null, and then it incorrectly checks if bin_file is non-null
    and only then adds a bunch of stuff to the cache hash. It needs to
    instead add to the cache hash based on lf_open_opts.

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