rst: Mark post_prepare_cbs static
rst: Mark post_prepare_cbs static

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

efiop/criu,efiop/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,eabatalov/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,efiop/criu,efiop/criu,eabatalov/criu,AuthenticEshkinKot/criu,efiop/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,eabatalov/criu,AuthenticEshkinKot/criu,eabatalov/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,efiop/criu,eabatalov/criu,eabatalov/criu,KKoukiou/criu-remote,KKoukiou/criu-remote