server: set custom execname for mesa dri-conf matching

Merged Ryan Neph requested to merge ryanneph/virglrenderer:set-execname into master

Need this to get app-specific driver configurations with Venus when process isolation is enabled.

Without process isolation, the dri-conf matching is still wrong but there are other options that can be explored later when multiple venus contexts share a process.

Signed-off-by: Ryan Neph

/cc @zzyiwei @olv @chadversary

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