egl_vendor path lead to fall back to LLVMPIPE

| commit | 0021f7dc (patch) |

change path to full path to libEGL_mesa.so - in my case Ubuntu 18.04.3 it is

{
    "ICD": {
        "library_path": "/usr/lib/x86_64-linux-gnu/libEGL_mesa.so"
    },
    "file_format_version": "1.0.0"
}

this lead to fallback to LLVMPIPE for all drivers (radeon, i965 and iris).

if you change it back to

{
    "file_format_version" : "1.0.0",
    "ICD" : {
        "library_path" : "libEGL_mesa.so.0"
    }
}

it will work correctly again. Reference

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