gmp: Update to v6.3.0

[Pheoxy]

Update GMP to v6.3.0

This pull request updates the GNU Multiple Precision Arithmetic Library (GMP) with the following enhancements:

Enhancements

1. LTO (Link Time Optimization) Support:

   • Added LTO support to improve the performance and optimization of the GMP library.

2. Additional Make Checks:

   • Included missing make check commands to ensure comprehensive testing during the build process.

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[ReillyBrogan]

Commits should be squashed, also we recently(ish) enabled LTO by default. That flag is no longer needed if you want it to continue using thin-lto. Alternately you can switch it to full LTO with lto: full

[Pheoxy]

Commits should be squashed, also we recently(ish) enabled LTO by default. That flag is no longer needed if you want it to continue using thin-lto. Alternately you can switch it to full LTO with lto: full

Thanks for the update. I deliberately kept the commits separate because I believe package version updates and other changes should remain distinct within the PR. Squashing them would mix these changes, making debugging more difficult later—even for a simple update like this.

Regarding the LTO flag, I appreciate the heads-up.

I don’t have the time to update this PR myself at the moment, but if someone else wants to take over, they’re welcome to.