Neil Roberts 7bab449700 renderer: Don't allow the COGL_DRIVER env var to override application
Since e07d0fc7441 the COGL_DRIVER environment variable was able to
override the application's driver selection. This doesn't seem like a
good idea because if the application is specifying a driver explicitly
then presumably it can not work with any other driver. This patch
changes it so that if a driver is selected in the configuration and by
the application then they must match, otherwise it will fail with a
CoglError.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 4e0942d74c8d69aa48e0176bfecf27f64a950d0f)
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