loader: Factor out the common driver opening logic from each loader.
I copied the code from egl_dri2.c, but the functionality was equivalent between all the loaders other than their particular environment variables. v2: Drop the logging function equivalent to loader_default_logger() (requested by Eric, Emil). Move the SCons workaround across. Drop the now-unused driGetDriverExtensions() declaration that was lost in a rebase. Reviewed-by: Eric Engestrom <email@example.com> (v1) Reviewed-by: Emil Velikov <firstname.lastname@example.org> (v1)
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