[gdal-dev] How to run autotest

[Even Rouault]

> Not sure how you find out I used libtool build. In my configure option,
> I did specify "--without-libtool".

/scratch/gdal/gdal/gdal/.libs/libgdal.so.20 is a file produced by a libtool 
build. You perhaps did initially a libtool build and then a non-libtool one.
Remove /scratch/gdal/gdal/gdal/.libs

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