libgrass driver confuses files

[Markus Neteler]

Frank (sorry, again),

when I use GDAL with GRASS support and AVHRR support, the
driver picks up a GRASS map before a local file.

Example:
In my current directory is a AVHRR file, in my GRASS location
a map with same name (e.g. after import).
gdalinfo, r.in.gdal etc. do no longer find the AVHRR file but
read from GRASS location.
Eventually the read order should be changed to check GRASS last.

Best regards

 Markus