* adds a hashglobe::alloc::realloc, as that was previously not implemented,
copying and simplifying from liballoc_system.
* routes malloc and realloc calls through hashglobe::alloc::, instead of
doing it via direct 'extern "C"' calls.
* removes the #[cfg(feature = "known_system_malloc")] markings in
fallible/lib.rs (the fallible vec stuff) on the assumption that we no
longer need to special-case these uses.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 04de056cde3c2626e2c8a4910dd69c9b5f9a5e11
b855c4d15b