gn: Fix escaping of interpreter, script, & source dir #652
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The wrong escaping mode is used in a few contexts, which results in failed builds. This is happening in particular to folks whose sources are inside a directory with a space in it, and whose builds are not contained within that directory.
Such builds encode the surrounding filesystem structure into the ninja files, which is unfortunate but unavoidable in some environments. Fix the escaping mode in this case.