fix: Use CMAKE_SHARED_LIBRARY_SUFFIX instead of hardcode .so

[middagj]

macOS uses .dylib and this is the only thing that prevents using CMake on macOS.

[jschlyter]

Can you rebase on develop so we test results?

[middagj]

Can you rebase on develop so we test results?

Done

[bjosv]

Nice. We could add CMake builds in CI for both Linux and Mac when this is merged then.

[middagj]

Thanks, I wasn't expecting this quick merge actually. There is another thing that is not helping with macOS (and probably Linux as well). But let me put that in another PR.

[middagj]

Never mind, I guess I am just running into the issue that install require relative dirs but GNUInstallDirs has absolute paths. Probably the reason why in this project the CMAKE_INSTALL_SYSCONFDIR and CMAKE_INSTALL_LOCALSTATEDIR are set to absolute values (which is not recommended).

The reporter created some alternative you might want to add.

Anyways, this is now how I configure:

cmake -H. -Bbuild \
    -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR \
    -DCMAKE_INSTALL_SYSCONFDIR=$INSTALL_DIR/etc \
    -DCMAKE_INSTALL_LOCALSTATEDIR=$INSTALL_DIR/var