Fix OutOfMemoryDeathTest.ViaSharedLibraries.

This test was invalid on modern glibc:
asprintf errors EOVERFLOW without attempting an allocation
when the size is at least INT_MAX - 32. INT_MAX - 33 is the
largest size that can attempt to trigger allocation failure,
and will not necessarily accomplish that on some systems.

Create a library that is specified to wrap malloc trivially,
to accomplish the goal of the test without external dependencies
or inconsistently implemented behavior.

BUG=428211

Review URL: https://codereview.chromium.org/878473002

Cr-Commit-Position: refs/heads/master@{#323197}

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