Remove explicit change of global allocator

This change removes the explicit change of the global allocator to the
system allocator that we introduced a while back.
The reason this was needed in the past was due to Rust's use of jemalloc
in the default configuration, which increases binary size quite
significantly. However, with Rust issue #36963 fixed, jemalloc is now an
explicit opt-in and the system allocator is the default choice --
rendering our explicit change rather pointless.

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