python-gdal is broken by libproj9 4.9.3-1 update

[Chris]

Hello, in python-gdal 2.1.1-1 _gdal.dll still uses cygproj-9.dll, but it was replaced with cygproj-12.dll in libproj9 4.9.3-1 so the import fails.
 
I was able to get a working system by downgrading libproj9 to 4.9.2-1 and libgeotiff2 to 1.4.1-1.

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