std: fix aliasing bug in UNIX process implementation #138896
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`CStringArray` contained both `CString`s and their pointers. Unfortunately, since `CString` uses `Box`, moving the `CString`s into the `Vec` can (under stacked borrows) invalidate the pointer to the string, meaning the resulting `Vec<*const c_char>` was, from an opsem perspective, unusable. This PR removes removes the `Vec<CString>` from `CStringArray`, instead recreating the `CString`/`CStr` from the pointers when necessary. Also,`CStringArray` is now used for the process args as well, the old implementation was suffering from the same kind of bug.
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CStringArraycontained bothCStrings and their pointers. Unfortunately, sinceCStringusesBox, moving theCStrings into theVeccan (under stacked borrows) invalidate the pointer to the string, meaning the resultingVec<*const c_char>was, from an opsem perspective, unusable. This PR removes removes theVec<CString>fromCStringArray, instead recreating theCString/CStrfrom the pointers when necessary. Also,CStringArrayis now used for the process args as well, the old implementation was suffering from the same kind of bug.