Clean backport. Tested in connection with 4 other WebKit fixes in the `test-kcr-11.0.19` branch, including a successful CI build. I also verfied that the native WebKit code is identical to mainline jfx after applying all patches (excluding a couple of copyright years).
------------- Commit messages: - 8293375: add_definitions USE_SYSTEM_MALLOC when USE_SYSTEM_MALLOC is ON Changes: https://git.openjdk.org/jfx11u/pull/129/files Webrev: https://webrevs.openjdk.org/?repo=jfx11u&pr=129&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8293375 Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx11u/pull/129.diff Fetch: git fetch https://git.openjdk.org/jfx11u pull/129/head:pull/129 PR: https://git.openjdk.org/jfx11u/pull/129
