apply simplified sve2 macro protection

src/video/SDL_blit_A.c

@@ -25,7 +25,7 @@
 #include "SDL_pixels_c.h"
 #include "SDL_surface_c.h"
 
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
 #include "./arm/SDL_sve2_blit_A.h"
 #endif
 
@@ -1481,7 +1481,7 @@ SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface)
             }
 
         case 2:
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
             if (SDL_HasSVE2()) {
                 if (sf->bytes_per_pixel == 4 &&
                     df->bytes_per_pixel == 2 &&
@@ -1519,11 +1519,11 @@ SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface)
                     return Blit8888to8888PixelAlphaSwizzleLSX;
                 }
 #endif
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
                 if (SDL_HasSVE2() 
             /* NEON is faster than SVE2 when vector size is 128bit */
             #if defined(SDL_NEON_INTRINSICS)
-                && SDL_GetSVEVectorSize() > 128
+                && (SDL_GetSVEVectorSize() > 128 || !SDL_HasNEON())
             #endif
                 ) {
                     // To prevent "unused function" compiler warnings/errors

src/video/SDL_blit_N.c

@@ -26,7 +26,7 @@
 #include "SDL_surface_c.h"
 #include "SDL_blit_copy.h"
 
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
 #include "./arm/SDL_sve2_blit_N.h"
 #endif
 
@@ -3121,7 +3121,7 @@ SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface *surface)
                 return Blit8888to8888PixelSwizzleSSE41;
             }
 #endif
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
             if (SDL_HasSVE2()) {
                 return Blit8888to8888PixelSwizzleSVE2;
             }
@@ -3132,7 +3132,7 @@ SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface *surface)
             }
 #endif
         }
-#if defined(SDL_SVE2_INTRINSICS) && (__ARM_ARCH >= 8) && (defined(__aarch64__) || defined(_M_ARM64))
+#ifdef SDL_SVE2_INTRINSICS
         if (SDL_HasSVE2()) {
             /* RGBA8888/ARGB8888/XRGB8888 -> RGB565 */
             if (srcfmt->bytes_per_pixel == 4 &&