[jfx17u] RFR: 8293375: add_definitions USE_SYSTEM_MALLOC when USE_SYSTEM_MALLOC is ON

[Ao Qi]

On Mon, 9 Jan 2023 13:29:27 GMT, Ao Qi <aoqi at openjdk.org> wrote:

> Clean backport. Verified on (after #102):
> - Linux/LoongArch64 (`USE_SYSTEM_MALLOC` is `on`, the platform triggering this problem)
> - Linux/x64 (`USE_SYSTEM_MALLOC` is `off`)
> - Linux/aarch64 (`USE_SYSTEM_MALLOC` is `off`)

RFC and RFR. Thanks.

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PR: https://git.openjdk.org/jfx17u/pull/103