Revert "include/linux: update pagevec header to match faux123 GS4 kernel"

This reverts commit bbf0aba3f69972d6e4237382195a8478a4e65c6f.
Revert "mm/sl[aou]b: squash commits from faux123,  slab/slub forward ported to Linux 3.8+"

This reverts commit 8f4b1bf26f5f3b9c453121a63e21a8ab4cbfc704.