fix(mesa): Use RHEL-like feature set for cloud/server distro

[christopherco]

Set rhel=10 to disable GPU drivers and features not relevant for Azure VMs (teflon, opencl, asahi, d3d12, embedded ARM GPUs, old AMD/Intel drivers). Keeps llvmpipe, virgl, radeonsi, iris/crocus, vmware, and basic Vulkan. Replace rust-toolset (RHEL meta-package) with cargo-rpm-macros.

[Copilot]

Pull request overview

Adjusts the mesa component configuration to build with a more RHEL-like feature profile suitable for Azure cloud/server environments, while ensuring Rust build dependencies remain compatible with Azure Linux packaging.

Changes:

• Added a dedicated base/comps/mesa/mesa.comp.toml to define rhel=10 at build time and apply an overlay to swap rust-toolset for cargo-rpm-macros.
• Removed the bare [components.mesa] entry from base/comps/components.toml now that mesa has per-component customization.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
base/comps/mesa/mesa.comp.toml	Introduces mesa-specific build macro defines and a spec overlay for Rust BuildRequires compatibility.
base/comps/components.toml	Removes the inline mesa component entry to avoid duplication now that a dedicated .comp.toml exists.

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