RFR: 8355235: Clean out old versions from Tools.gmk

[Magnus Ihse Bursie]

On Mon, 21 Apr 2025 22:51:33 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

> Traditionally, when upgrading the versions of the components (gcc, binutils, etc.) in Tools.gmk, the old versions/definitions have been preserved. The list is now starting to be on the long side, it's unlikely that anybody would be using anything but the latest/default version, and if they do it is possible to get it from the source/version history.
> 
> Let's clean out the old version information, leaving only the latest/default.
> 
> Testing: tier1, manually built devkits for `x86_64-linux-gnu-to-{x86_64,aarch64,ppc64le,riscv64,s390x}-linux-gnu` and then built the JDK using those devkits.

Going forward, I don't think we even need to save more than a single version in the makefile. If we want older versions, well, that's what git is for.

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PR Comment: https://git.openjdk.org/jdk/pull/24784#issuecomment-2834795468