Fix finding libudev on 64-bit openSUSE

On 64-bit openSUSE, libudev is installed at /usr/lib64/libudev.0. This adds /usr/lib64 to the search path which prevents the following error when you try to start light table:

    libudev.so.0 or libudev.so.1 not found in any of /lib /lib64 /lib/x86_64-linux-gnu /usr/lib /usr/lib/x86_64-linux-gnu.