remove indirect use of endian.h from public headers

building on commit 97d35a552e,
__BYTE_ORDER is now available wherever alltypes.h is included.
endian.h should not be used since, in the future, it will expose
identifiers that are not in the reserved namespace for the headers
which were previously using it.

arch/aarch64/bits/socket.h

@@ -1,5 +1,3 @@
-#include <endian.h>
-
 struct msghdr {
 	void *msg_name;
 	socklen_t msg_namelen;

arch/mips64/bits/socket.h

@@ -1,5 +1,3 @@
-#include <endian.h>
-
 struct msghdr {
 	void *msg_name;
 	socklen_t msg_namelen;

arch/powerpc64/bits/socket.h

@@ -1,5 +1,3 @@
-#include <endian.h>
-
 struct msghdr {
 	void *msg_name;
 	socklen_t msg_namelen;

arch/riscv64/bits/socket.h

@@ -1,5 +1,3 @@
-#include <endian.h>
-
 struct msghdr {
 	void *msg_name;
 	socklen_t msg_namelen;

include/arpa/nameser.h

@@ -7,7 +7,6 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
-#include <endian.h>
 
 #define __NAMESER	19991006
 #define NS_PACKETSZ	512

include/netinet/icmp6.h

@@ -9,7 +9,6 @@ extern "C" {
 #include <string.h>
 #include <sys/types.h>
 #include <netinet/in.h>
-#include <endian.h>
 
 #define ICMP6_FILTER 1
 

include/netinet/ip.h

@@ -7,7 +7,6 @@ extern "C" {
 
 #include <stdint.h>
 #include <netinet/in.h>
-#include <endian.h>
 
 struct timestamp {
 	uint8_t len;

include/netinet/ip6.h

@@ -7,7 +7,6 @@ extern "C" {
 
 #include <stdint.h>
 #include <netinet/in.h>
-#include <endian.h>
 
 struct ip6_hdr {
 	union {

include/netinet/tcp.h

@@ -97,7 +97,6 @@ enum {
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <stdint.h>
-#include <endian.h>
 
 typedef uint32_t tcp_seq;
 

include/sys/acct.h

@@ -6,7 +6,6 @@ extern "C" {
 #endif
 
 #include <features.h>
-#include <endian.h>
 #include <time.h>
 #include <stdint.h>
 

include/sys/sem.h

@@ -25,8 +25,6 @@ extern "C" {
 #define SETVAL		16
 #define SETALL		17
 
-#include <endian.h>
-
 #include <bits/sem.h>
 
 #define _SEM_SEMUN_UNDEFINED 1

include/sys/statvfs.h

@@ -11,8 +11,6 @@ extern "C" {
 #define __NEED_fsfilcnt_t
 #include <bits/alltypes.h>
 
-#include <endian.h>
-
 struct statvfs {
 	unsigned long f_bsize, f_frsize;
 	fsblkcnt_t f_blocks, f_bfree, f_bavail;