src/idmapped-mounts: Remove useless header file

When compile xfstest on old kernel, mount-idmapped.c will fail
because of missing linux/bpf.h. But this src file doesn't use bpf
realted functions or macros.

So remove these useless header files in idmapped-mounts.c and
mount-idmapped.c.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

src/idmapped-mounts/idmapped-mounts.c

@@ -16,11 +16,9 @@
 #include <pthread.h>
 #include <sched.h>
 #include <stdbool.h>
-#include <sys/acl.h>
 #include <sys/fsuid.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <sys/sysmacros.h>
 #include <sys/xattr.h>
 #include <unistd.h>
 

src/idmapped-mounts/mount-idmapped.c

@@ -9,11 +9,8 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
-#include <libgen.h>
 #include <limits.h>
-#include <linux/bpf.h>
 #include <linux/sched.h>
-#include <linux/seccomp.h>
 #include <sched.h>
 #include <signal.h>
 #include <stdbool.h>
@@ -21,7 +18,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <sys/types.h>