[pdal] Workaround for current Conda issues on Windows

[Bradley Chambers]

Windows users installing PDAL via Conda may be running into issues with
missing libtiff.dll. This is ticketed with the upstream packages and will
hopefully be fixed soon. In the meantime, it is possible to workaround by
pinning to an older build of libtiff. The following should do the trick
(tested for Python 3.6)

conda create -n pdalenv -c conda-forge pdal libtiff=4.0.9=vc14_0
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