Fix file collision on armel and armhf

[MrMeshok]

In Debian we got this warning

There are issues with the multiarch metadata for this package.
mangohud conflicts on /usr/share/vulkan/implicit_layer.d/MangoHud.arm.json on armel <-> armhf

If you try to install both armel and armhf packages you will get this error

trying to overwrite shared '/usr/share/vulkan/implicit_layer.d/MangoHud.arm.json', which is different from other instances of package mangohud:armhf

After this change this will work.
To test this change I compiled for amd64, i386, armel, armhf and got this results

arch	before	after
amd64	MangoHud.x86_64.json	MangoHud.x86_64.json
i386	MangoHud.x86.json	MangoHud.x86.json
armel	MangoHud.arm.json	MangoHud.armel.json
armhf	MangoHud.arm.json	MangoHud.arm7hlf.json

[MrMeshok]

Looking at i386 results now I realized, that install/uninstall scripts should be adjusted.
I can do this, but maybe this should be Debian only patch 🤔

[flightlessmango]

I was racking my brain trying to think of how this could possibly mess with downstream, but I think it should be fine?
I'm curious how other projects tend to handle this

[MrMeshok]

MangoHud/bin/mangohud-setup.sh

Line 35 in aa4333f

rm -fv "/usr/share/vulkan/implicit_layer.d/MangoHud.x86.json"

MangoHud/bin/mangohud-setup.sh

Line 72 in aa4333f

/usr/bin/install -Dvm644 ./usr/share/vulkan/implicit_layer.d/MangoHud.x86.json /usr/share/vulkan/implicit_layer.d/MangoHud.x86.json

This lines would need to be adjusted because now this file would be named "MangoHud.i386.json" and old x86 name should be kept in uninstall so new install/uninstall script can uninstall older version.

I will look into how other distros handle this, but they probably don't have this problem because not many build for armel and armhf

[MrMeshok]

I found very few distros that supports armel and didn't based on Debian and they all have the same problem.
But I thought about it more and rewritten this PR to only affect arm 32 bit architectures, so this change will have very small footprint and didn't need any changes for install/uninstall script

[MrMeshok]

Also found a similar issue for mesa
https://gitlab.freedesktop.org/mesa/mesa/-/issues/13745