Build failure - port amd64 - librump

[Paul Goyette <paul%whooppee.com@localhost>]

Sources updated just a few minutes ago, and object directory (and tools 
directory) completely erased before building...

/build/obj/amd64/sys/rump/librump/rumpkern/librump.a(vfs_init.o): In 
function `vfsinit':
/build/src/sys/kern/vfs_init.c:340: undefined reference to 
`__start_link_set_vfsops'
/build/src/sys/kern/vfs_init.c:340: undefined reference to 
`__stop_link_set_vfsops'
collect2: ld returned 1 exit status
*** [cd9660fs] Error code 1


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