cmake: Use GNUInstallDirs to install data directories #41
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Solves issues with cross environments where prefix is set to e.g.
-DCMAKE_INSTALL_PREFIX:PATH=/usr/x86_64-pc-linux-gnu
and the arch independent files would end up under the prefix as well instead of/usr/share
.Note: variables offered by CMake
GNUInstallDirs
could probably be used for the various other stuff as well like for getting rid of the__lib
hack by usingCMAKE_INSTALL_LIBDIR
but I just wanted to solve an actual issue I ran across with this PR.