perf build: Compare mman.h related headers against kernel originals

As with other cloned headers, compare the newly introduced mman related
headers against their source copy in kernel tree.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1473684871-209320-4-git-send-email-wangnan0@huawei.com


[ Added -I to ignore the uapi/ difference ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>