Importing pyzes fails because _LoadZeLibrary() hardcodes /usr/lib/x86_64-linux-gnu/lib

Current code:
`libName = "/usr/lib/x86_64-linux-gnu/lib" + libName + ".so.1"`

Results in this:

```
OSError: /usr/lib/x86_64-linux-gnu/libze_loader.so.1:
cannot open shared object file
```

Replacing the hardcoded path with something like:

```
from ctypes.util import find_library
libName = find_library("ze_loader")
```

fixes the issue.