FreeBSD/src ff9b61c (r305168)sys/dev/ixl if_ixlv.c ixl_txrx.c, sys/dev/netmap if_ixl_netmap.h

Fix linker warnings (errors on gcc) that resulted from r304510.

The variables that are extern in the netmap header file should be
defined in ixl_txrx.c (the file that is included in both ixl(4)/ixlv(4),
not in the main driver source files.

Reported by:    ed@, dim@, ngie@
DeltaFile
+0-5sys/dev/ixl/if_ixlv.c
+1-0sys/dev/ixl/ixl_txrx.c
+0-1sys/dev/netmap/if_ixl_netmap.h
+1-63 files

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