turn ptrdiff_t into a 64 bit type

while technically a 32 bit ptrdiff_t is in spec on
systems with 64 bit ponters as long as we guarantee
that individual objects are small enough, this can
confuse legitimate code, so lets fix this.

amd64/include/ape/stddef.h

@@ -0,0 +1,7 @@
+#ifndef __STDDEF_ARCH_H
+#define __STDDEF_ARCH_H
+
+typedef long long _ptrdiff_t;
+#include "/sys/include/ape/stddef.h"
+
+#endif /* __STDDEF_ARCH_H */

arm64/include/ape/stddef.h

@@ -0,0 +1,7 @@
+#ifndef __STDDEF_ARCH_H
+#define __STDDEF_ARCH_H
+
+typedef long long _ptrdiff_t;
+#include "/sys/include/ape/stddef.h"
+
+#endif /* __STDDEF_ARCH_H */

sys/include/ape/stddef.h

@@ -1,6 +1,10 @@
 #ifndef __STDDEF_H
 #define __STDDEF_H
 
+#ifndef __STDDEF_ARCH_H
+typedef long _ptrdiff_t;
+#endif
+
 #ifndef NULL
 #ifdef __cplusplus
 #define NULL 0
@@ -10,7 +14,7 @@
 #endif
 #define offsetof(ty,mem) ((size_t) &(((ty *)0)->mem))
 
-typedef long ptrdiff_t;
+typedef _ptrdiff_t ptrdiff_t;
 #ifndef _SIZE_T
 #define _SIZE_T
 typedef unsigned long size_t;