[bug#53015] [PATCH v2] Add mangohud.

[John Kehayias]

Hi Maxim (and anyone else),

Attached is an update to this patch series, reduced to just one patch. This 
relies on the hwdata package added in https://issues.guix.gnu.org/54069#2  and 
the update to imgui I sent in https://issues.guix.gnu.org/54132

With that, mangohud just uses imgui-1.86 (the newer version has a breaking 
change). The modifications to the meson.build is handled in a build phase 
substitute* rather than a patch, as it needs the imgui location.

I've checked this builds and works. Let me know if any other modifications are 
needed, other than the hwdata and imgui fixes referenced.

Thanks!
John

0001-gnu-Add-mangohud.patch
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