xen-tmem-enable-xen-tmem-shim-to-be-built-loaded-as-a-module-fix

xen-tmem-enable-xen-tmem-shim-to-be-built-loaded-as-a-module-fix

fix build (disable_frontswap_selfshrinking undeclared)

Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Bob Liu <lliubbo@gmail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>