Fix strict ordering of EGL configs.

Change-Id: I51c1774a35706639481c030b4365ee2e5d7ccd4d
Reviewed-on: https://swiftshader-review.googlesource.com/4255
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>