CMakeLists.txt: removed spdlog subdir from library install
CMakeLists.txt: removed spdlog subdir from library install

The library gets installed into ${CMAKE_INSTALL_LIBDIR}/spdlog, which
is for unix / linux a rather strange place, hence, put it where the linker
is more likely to find it.

Signed-off-by: Matthias Schoepfer <91281656c47335ea6cd1bf4afd0d846782399ecb@ithinx.io>

hunter-packages/spdlog,hunter-packages/spdlog,hunter-packages/spdlog