WIP: egl: implement EGL_MESA_QUERY_RENDERER
Firefox requested to have a way to query the device's vendor PCI ID and device PCI ID. A possible way to
do these queries is by implementing EGL_MESA_QUERY_RENDERER as first proposed here
References:
Mesa implementation (here. DRI2 implementation, not sure what more would be needed for DRI3)
A different extension EGL_EXT_device_query_pci
to solve the same issue has also been proposed here
Edited by Vasilis Liaskovitis