[GRASS5] [bug #2059] (grass) fix gdal lib check for Mac OS X

this bug's URL: http://intevation.de/rt/webrt?serial_num=2059

Request number 2059 was commented on by 'pkelly' (Paul Kelly).
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Cc: grass5@grass.itc.it

A few comments (none of them the definitive answer):
1) gdalbridge is not really part of GRASS, but of GDAL; only a copy of it is
included in GRASS

2) If you compile with the --with-gdal option to the configure script,
gdalbridge should not be used---did you get an error or were you just looking
though the source code?

3) gdalbridge will probably be removed in the future as it seems to be a bit
unreliable and already in GRASS 5.7.x --with-gdal is a default option

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