Remove kernel-devel from build requirements
    
    kernel-devel package was added because I thought it may resolve bluetooth
    related build failure. After addition of dependency packages started building
    again however with bluetooth support disabled.
    
    Probably the *right* thing to do would be to move away from bluez
    dependency, because code that use bluez-libs anyway. This is currently discussed
    upstream.
    
    See: https://github.com/the-tcpdump-group/libpcap/pull/417/