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

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2059
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Subject: fix gdal lib check for Mac OS X

Platform: other
grass obtained from: CVS
grass binary for platform: Compiled from Sources
GRASS Version: all

in gdalbridge.c, where it checks for the existence of the gdal library, add a case for Mac OS X 
dylibs:

'libgdal.1.1.dylib'

- William Kyngesburye

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