Similar to r212647, remove the workaround in sys/net/vnet.h for an ld bug (incorrect placement of __start_SECNAME in some cases) that was fixed in r210245.
Similar to r212647, remove the workaround in sys/net/vnet.h for an ld
bug (incorrect placement of __start_SECNAME in some cases) that was
fixed in r210245.

There is already an UPDATING entry about needing a recent ld.

MFC after:	1 month

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