New issue by gspe on void-packages repository

https://github.com/void-linux/void-packages/issues/27965

Description:
this pr https://github.com/void-linux/void-packages/pull/24884 remove `--datadir=/usr/lib` but not set `--datadir=/usr/share` so now qemu package has broken support for uefi, for example this is the content of `60-edk2-x86_64.json` :
```
cat /usr/share/qemu/firmware/60-edk2-x86_64.json
{
    "description": "UEFI firmware for x86_64",
    "interface-types": [
        "uefi"
    ],
    "mapping": {
        "device": "flash",
        "executable": {
            "filename": "share/qemu/edk2-x86_64-code.fd",
            "format": "raw"
        },
        "nvram-template": {
            "filename": "share/qemu/edk2-i386-vars.fd",
            "format": "raw"
        }
    },
    "targets": [
        {
            "architecture": "x86_64",
            "machines": [
                "pc-i440fx-*",
                "pc-q35-*"
            ]
        }
    ],
    "features": [
        "acpi-s3",
        "amd-sev",
        "verbose-dynamic"
    ],
    "tags": [

    ]
}
```

as you can see the filename path is not correct ` "filename": "share/qemu/edk2-i386-vars.fd",`