Integrate fix for Source 2's Win32 build that does '#define __i386__ 1' which causes it to hit the __i386__ case instead of the _MSC_VER case.

include/SDL_endian.h

@@ -112,6 +112,9 @@ extern "C" {
 
 #if HAS_BUILTIN_BSWAP16
 #define SDL_Swap16(x) __builtin_bswap16(x)
+#elif defined(_MSC_VER)
+#pragma intrinsic(_byteswap_ushort)
+#define SDL_Swap16(x) _byteswap_ushort(x)
 #elif defined(__i386__) && !HAS_BROKEN_BSWAP
 SDL_FORCE_INLINE Uint16
 SDL_Swap16(Uint16 x)
@@ -149,9 +152,6 @@ SDL_Swap16(Uint16 x)
   __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
     return x;
 }
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_ushort)
-#define SDL_Swap16(x) _byteswap_ushort(x)
 #elif defined(__WATCOMC__) && defined(__386__)
 extern _inline Uint16 SDL_Swap16(Uint16);
 #pragma aux SDL_Swap16 = \
@@ -168,6 +168,9 @@ SDL_Swap16(Uint16 x)
 
 #if HAS_BUILTIN_BSWAP32
 #define SDL_Swap32(x) __builtin_bswap32(x)
+#elif defined(_MSC_VER)
+#pragma intrinsic(_byteswap_ulong)
+#define SDL_Swap32(x) _byteswap_ulong(x)
 #elif defined(__i386__) && !HAS_BROKEN_BSWAP
 SDL_FORCE_INLINE Uint32
 SDL_Swap32(Uint32 x)
@@ -213,9 +216,6 @@ extern _inline Uint32 SDL_Swap32(Uint32);
   "bswap eax"  \
   parm   [eax] \
   modify [eax];
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_ulong)
-#define SDL_Swap32(x) _byteswap_ulong(x)
 #else
 SDL_FORCE_INLINE Uint32
 SDL_Swap32(Uint32 x)
@@ -227,6 +227,9 @@ SDL_Swap32(Uint32 x)
 
 #if HAS_BUILTIN_BSWAP64
 #define SDL_Swap64(x) __builtin_bswap64(x)
+#elif defined(_MSC_VER)
+#pragma intrinsic(_byteswap_uint64)
+#define SDL_Swap64(x) _byteswap_uint64(x)
 #elif defined(__i386__) && !HAS_BROKEN_BSWAP
 SDL_FORCE_INLINE Uint64
 SDL_Swap64(Uint64 x)
@@ -258,9 +261,6 @@ extern _inline Uint64 SDL_Swap64(Uint64);
   "xchg eax,edx"  \
   parm [eax edx]  \
   modify [eax edx];
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_uint64)
-#define SDL_Swap64(x) _byteswap_uint64(x)
 #else
 SDL_FORCE_INLINE Uint64
 SDL_Swap64(Uint64 x)