merge from dev

src/alloc.c

@@ -584,6 +584,7 @@ mi_decl_nodiscard void* mi_new_reallocn(void* p, size_t newcount, size_t size) {
 #ifdef __cplusplus
 void* _mi_externs[] = {
   (void*)&_mi_page_malloc,
+  (void*)&_mi_page_malloc_zero,
   (void*)&_mi_heap_malloc_zero,
   (void*)&_mi_heap_malloc_zero_ex,
   (void*)&mi_malloc,

src/arena-abandon.c

@@ -13,8 +13,6 @@ terms of the MIT license. A copy of the license can be found in the file
 #include "bitmap.h"
 #endif
 
-typedef struct mi_arena_s mi_arena_t;
-
 // Minimal exports for arena-abandoned.
 size_t      mi_arena_id_index(mi_arena_id_t id);
 mi_arena_t* mi_arena_from_index(size_t idx);

src/arena.c

@@ -62,7 +62,7 @@ static mi_decl_cache_align _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS];
 static mi_decl_cache_align _Atomic(size_t)      mi_arena_count; // = 0
 
 #define MI_IN_ARENA_C
-#include "arena-abandoned.c"
+#include "arena-abandon.c"
 #undef MI_IN_ARENA_C
 
 /* -----------------------------------------------------------