ASAN Issue (#528)

On MSVC I get a
```
==9952==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x11e8718f6e00,0x11e8718f6e78) and [0x11e8718f6e18, 0x11e8718f6e90) overlap
```
Since the CRT memcpy memory is not allowed to overlap (see: https://learn.microsoft.com/en-us/cpp/sanitizers/error-memcpy-param-overlap?view=msvc-170 )
And SDL_memcpy uses memcpy by default.

Author: tanolino

src/SDL_renderer_textengine.c

@@ -367,7 +367,7 @@ static bool ResolveMissingGlyphs(TTF_RendererTextEngineData *enginedata, AtlasTe
             // Remove this from the missing entries
             --num_missing;
             if (i < num_missing) {
-                SDL_memcpy(&missing[i], &missing[i+1], (num_missing - i) * sizeof(missing[i]));
+                SDL_memmove(&missing[i], &missing[i + 1], (num_missing - i) * sizeof(missing[i]));
             }
         }
         if (num_missing == 0) {