fix #378 , error: use of undeclared identifier 'KBUILD_MODNAME'

[cfc4n]

fix #378

Compilation error make nocore.

In file included from kern/openssl_1_1_1a_kern.c:46:
In file included from ./kern/openssl.h:15:
In file included from ./kern/ecapture.h:50:
In file included from /lib/modules/5.15.0-1040-azure/build/include/net/sock.h:59:
In file included from /lib/modules/5.15.0-1040-azure/build/include/linux/filter.h:25:
In file included from /lib/modules/5.15.0-1040-azure/build/include/net/sch_generic.h:21:
/lib/modules/5.15.0-1040-azure/build/include/net/flow_offload.h:359:3: error: use of undeclared identifier 'KBUILD_MODNAME'
                NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
                ^
/lib/modules/5.15.0-1040-azure/build/include/linux/netlink.h:102:27: note: expanded from macro 'NL_SET_ERR_MSG_MOD'
        NL_SET_ERR_MSG((extack), KBUILD_MODNAME ": " msg)
                                 ^