SVN r296272 breaks virtualbox

[Michael Butler]

The removal of "taskqueue_enqueue_fast" breaks the virtualbox kmods:

Mar  1 16:54:36 toshi kernel: vboxdrv: fAsync=0 offMin=0x914 offMax=0x151c
Mar  1 16:54:36 toshi kernel: link_elf_obj: symbol
taskqueue_enqueue_fast undefined
Mar  1 16:54:36 toshi kernel: linker_load_file: Unsupported file type
Mar  1 16:54:36 toshi kernel: link_elf_obj: symbol
taskqueue_enqueue_fast undefined
Mar  1 16:54:36 toshi kernel: linker_load_file: Unsupported file type
Mar  1 16:54:36 toshi kernel: KLD vboxnetadp.ko: depends on vboxnetflt -
not available or version mismatch
Mar  1 16:54:36 toshi kernel: linker_load_file: Unsupported file type

	Michael