Clean up _BYTE_ORDER definitions for better x86 portability.

We'd manually hacked _BYTE_ORDER into the arm and mips "_types.h" headers,
but not into the x86 one. Judging by upstream, _BYTE_ORDER should be in
the "endian.h" headers instead, so let's uniformly do that.

I've also ironed out some of the other differences between the different
architectures' header files too.

Bug: http://code.google.com/p/android/issues/detail?id=39824
Change-Id: I19d3af7ffd74e1c02b1b6886aec0f0d11f44ab8d

libc/arch-arm/include/endian.h

@@ -77,7 +77,7 @@
 #endif  /* __ARM_ARCH__ */
 #endif  /* __GNUC__ */
 
-#ifdef __ARMEB__
+#if defined(__ARMEB__)
 #define _BYTE_ORDER _BIG_ENDIAN
 #else
 #define _BYTE_ORDER _LITTLE_ENDIAN

libc/arch-arm/include/machine/_types.h

@@ -116,10 +116,4 @@ typedef	int			__rune_t;
 typedef	void *			__wctrans_t;
 typedef	void *			__wctype_t;
 
-#ifdef __ARMEB__
-#define _BYTE_ORDER _BIG_ENDIAN
-#else
-#define _BYTE_ORDER _LITTLE_ENDIAN
-#endif
-
 #endif	/* _ARM__TYPES_H_ */

libc/arch-mips/include/endian.h

@@ -29,17 +29,6 @@
 #ifndef _MIPS64_ENDIAN_H_
 #define _MIPS64_ENDIAN_H_
 
-#if defined(__MIPSEL__)
-#define _BYTE_ORDER _LITTLE_ENDIAN
-#endif
-#if defined(__MIPSEB__)
-#define _BYTE_ORDER _BIG_ENDIAN
-#endif
-
-#if !defined(_BYTE_ORDER) && !defined(lint)
-#error "__MIPSEL__ or __MIPSEB__ must be defined to define BYTE_ORDER!!!"
-#endif
-
 #ifdef __GNUC__
 
 #if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
@@ -69,9 +58,13 @@
 #endif  /* __mips32r2__ */
 #endif  /* __GNUC__ */
 
-
+#if defined(__MIPSEB__)
+#define _BYTE_ORDER _BIG_ENDIAN
+#else
+#define _BYTE_ORDER _LITTLE_ENDIAN
+#endif
+#define __STRICT_ALIGNMENT
+#include <sys/types.h>
 #include <sys/endian.h>
 
-#define	__STRICT_ALIGNMENT
-
 #endif /* _MIPS64_ENDIAN_H_ */

libc/arch-mips/include/machine/_types.h

@@ -124,12 +124,6 @@ typedef	int			__rune_t;
 typedef	void *			__wctrans_t;
 typedef	void *			__wctype_t;
 
-#ifdef __MIPSEB__
-#define _BYTE_ORDER _BIG_ENDIAN
-#else
-#define _BYTE_ORDER _LITTLE_ENDIAN
-#endif
-
 #if defined(_KERNEL)
 typedef struct label_t {
 	__register_t val[14];

libc/arch-x86/include/endian.h

@@ -65,6 +65,7 @@
 #endif	/* __GNUC__ */
 
 #define _BYTE_ORDER _LITTLE_ENDIAN
+#include <sys/types.h>
 #include <sys/endian.h>
 
 #endif /* _I386_ENDIAN_H_ */