lwip, wpa_supplicant: use endianness macros from libc if possible

components/lwip/port/esp32/include/arch/cc.h

@@ -41,7 +41,9 @@
 
 #include "arch/sys_arch.h"
 
+#ifndef BYTE_ORDER
 #define BYTE_ORDER LITTLE_ENDIAN
+#endif // BYTE_ORDER
 
 typedef uint8_t  u8_t;
 typedef int8_t   s8_t;

components/wpa_supplicant/port/include/byteswap.h

@@ -5,7 +5,10 @@
 #ifndef BYTESWAP_H
 #define BYTESWAP_H
 
+#include <machine/endian.h>
+
 /* Swap bytes in 16 bit value.  */
+#ifndef __bswap_16
 #ifdef __GNUC__
 # define __bswap_16(x) \
     (__extension__							      \
@@ -18,8 +21,10 @@ __bswap_16 (unsigned short int __bsx)
   return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
 }
 #endif
+#endif // __bswap_16
 
 /* Swap bytes in 32 bit value.  */
+#ifndef __bswap_32
 #ifdef __GNUC__
 # define __bswap_32(x) \
     (__extension__							      \
@@ -34,7 +39,9 @@ __bswap_32 (unsigned int __bsx)
 	  (((__bsx) & 0x0000ff00) <<  8) | (((__bsx) & 0x000000ff) << 24));
 }
 #endif
+#endif // __bswap_32
 
+#ifndef __bswap_64
 #if defined __GNUC__ && __GNUC__ >= 2
 /* Swap bytes in 64 bit value.  */
 # define __bswap_constant_64(x) \
@@ -61,5 +68,6 @@ __bswap_32 (unsigned int __bsx)
 	   }								      \
 	 __r.__ll; }))
 #endif
+#endif // __bswap_64
 
 #endif /* BYTESWAP_H */

components/wpa_supplicant/port/include/endian.h

@@ -30,6 +30,7 @@
 #define _ENDIAN_H_
 
 #include <stdint.h>
+#include <sys/types.h>
 #include "byteswap.h"
 
 #ifndef BIG_ENDIAN