tools/bpf/bpftool: Remove duplicate headers

Code cleanup: Remove duplicate headers which are included twice.
Signed-off-by: Jagadeesh Pagadala <jagdsh.linux@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/1587274757-14101-1-git-send-email-jagdsh.linux@gmail.com

tools/bpf/bpftool/btf.c

@@ -15,7 +15,6 @@
 #include <linux/hashtable.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <unistd.h>
 
 #include "json_writer.h"
 #include "main.h"

tools/bpf/bpftool/gen.c

@@ -17,7 +17,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
-#include <unistd.h>
 #include <bpf/btf.h>
 
 #include "bpf/libbpf_internal.h"

tools/bpf/bpftool/jit_disasm.c

@@ -15,7 +15,6 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdint.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <unistd.h>