Remove GPL-3.0 license file.
Remove GPL-3.0 license file.

There is no code licensed GPL-3.0 so we might as well remove this file.

karlhiramoto/libnl,karlhiramoto/libnl,teto/libnl_old,UnicronNL/libnl3,cfriedt/libnl,tklauser/libnl,chitranshi/libnl,claudelee/libnl,honsys/libnl,HolyShitMan/libnl-1,teto/libnl_old,honsys/libnl,tgraf/libnl,dsahern/libnl,cfriedt/libnl,chitranshi/libnl,kolyshkin/libnl,socketpair/libnl,houstar/libnl,tgraf/libnl,tklauser/libnl,houstar/libnl,kolyshkin/libnl,kolyshkin/libnl,claudelee/libnl,congwang/libnl,chitranshi/libnl,mshirley/libnl,karlhiramoto/libnl,cyclops8456/libnl3,houstar/libnl,vyos/libnl3,mshirley/libnl,tklauser/libnl,Distrotech/libnl,thom311/libnl,cyclops8456/libnl3,thom311/libnl,cfriedt/libnl,socketpair/libnl,UnicronNL/libnl3,socketpair/libnl,cyclops8456/libnl3,claudelee/libnl,baloo/libnl,Distrotech/libnl,baloo/libnl,greearb/libnl-ct,mshirley/libnl,dsahern/libnl,houstar/libnl,mshirley/libnl,claudelee/libnl,tgraf/libnl,dsahern/libnl,HolyShitMan/libnl-1,greearb/libnl-ct,UnicronNL/libnl3,vyos/libnl3,honsys/libnl,chitranshi/libnl,UnicronNL/libnl3,Distrotech/libnl,thom311/libnl,tklauser/libnl,HolyShitMan/libnl-1,baloo/libnl,congwang/libnl,greearb/libnl-ct,teto/libnl_old,dsahern/libnl,baloo/libnl,cfriedt/libnl,HolyShitMan/libnl-1,karlhiramoto/libnl,teto/libnl_old,congwang/libnl,vyos/libnl3,cyclops8456/libnl3,Distrotech/libnl,tgraf/libnl,congwang/libnl,vyos/libnl3,kolyshkin/libnl,honsys/libnl