RFR: 8377905: gcc.md included with every build

[Erik Joelsson]

On Fri, 20 Feb 2026 22:38:20 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

> JDK-8377509 added the gcc.md license file. Unfortunately the file is unconditionally in the built JDK regardless of the toolchain used. This change updates the build logic to only include the file when relevant.
> 
> Testing: tier1, builds-tier[2-5], manual verification to ensure the file is only included where expected.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29853#pullrequestreview-3834648917