Add missing include

Starbuck5 · Starbuck5 · commit 92f0a40ef9be · 2025-01-26T18:02:46.000-08:00
diff --git a/src_c/pixelarray.c b/src_c/pixelarray.c
@@ -23,6 +23,7 @@
 #include "pygame.h"
 
 #include "pgcompat.h"
+#include <stddef.h>
 
 #include "doc/pixelarray_doc.h"
 
