[Geotiff] libgeotiff 1.7.3 is released

[Even Rouault]

Hi,

Follow-up release of 1.7.2 to address a regression with CMake builds 
related to a typo in CMAKE_INSTALL_BINDIR install target that affects 
location of geotiff.dll (#117)

Source packages can be found at:

https://download.osgeo.org/geotiff/libgeotiff/libgeotiff-1.7.3.tar.gz
https://download.osgeo.org/geotiff/libgeotiff/libgeotiff-1.7.3.zip

Even

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