RFR: 8373113: Fix whitespace in RunTests.gmk

[Tim Bell]

On Thu, 4 Dec 2025 21:32:38 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> While reading RunTests.gmk recently I found several instances of bad whitespace usage, tabs vs spaces. Correct usage of tabs is important in makefiles and even if none of these are particularly severe on their own, they can compound with other mistakes to create very hard to debug problems.

Looks good

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Marked as reviewed by tbell (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28668#pullrequestreview-3542678293