Wrong path on fedora for installation

```
...
-- Installing: /usr/local/include/compute/boost/compute/type_traits/scalar_type.hpp
-- Installing: /usr/local/include/compute/boost/compute/type_traits/type_definition.hpp
-- Installing: /usr/local/include/compute/boost/compute/type_traits/type_name.hpp
-- Installing: /usr/local/include/compute/boost/compute/type_traits/vector_size.hpp
-- Installing: /usr/local/include/compute/boost/compute/types.hpp
-- Installing: /usr/local/include/compute/boost/compute/types
-- Installing: /usr/local/include/compute/boost/compute/types/builtin.hpp
-- Installing: /usr/local/include/compute/boost/compute/types/complex.hpp
...
```

But library itself uses

```
#include
```
(for example)

So the installation path should be
```
-- Installing: /usr/local/include/boost/compute/type_traits/vector_size.hpp
-- Installing: /usr/local/include/boost/compute/types.hpp
-- Installing: /usr/local/include/boost/compute/types
```
I made fork and fixed it for myself. I don't know should I make a PR (I just changed installation path in CMake install target and CMake configuration file).