Define RNA_STACK_ARRAY (usable everywhere in RNA), and make PYRNA_STACK_ARRAY use it.

source/blender/makesrna/RNA_types.h

@@ -108,6 +108,8 @@ typedef enum PropertyUnit {
 
 #define RNA_TRANSLATION_PREC_DEFAULT 5
 
+#define RNA_STACK_ARRAY 32
+
 /* also update enums in bpy_props.c when adding items here
  * watch it: these values are written to files as part of
  * node socket button subtypes!

source/blender/python/intern/bpy_props.h

@@ -34,6 +34,6 @@ PyObject *BPy_PointerProperty(PyObject *self, PyObject *args, PyObject *kw);
 PyObject *BPy_CollectionProperty(PyObject *self, PyObject *args, PyObject *kw);
 StructRNA *pointer_type_from_py(PyObject *value, const char *error_prefix);
 
-#define PYRNA_STACK_ARRAY 32
+#define PYRNA_STACK_ARRAY RNA_STACK_ARRAY
 
 #endif