Fix python module installation with alternative root/prefix #6370
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Trying to package/build mapserver head before 8.0, it failed for me during install/fake, as it tried writing to the system dirs in usr/local while CMAKE_INSTALL_PREFIX and DESTDIR were properly defined - and ignored.
i think this was an oversight in the large commit done in dd310d2. Not 100% confident about all cases, but this fixes the 'install to alternate dir' problem for me. Cmake expert feedback welcome :)