Don't export symbol

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Author: DinoV

Objects/mimalloc/alloc.c

@@ -16,6 +16,8 @@ terms of the MIT license. A copy of the license can be found in the file
 #include <string.h>      // memset, strlen (for mi_strdup)
 #include <stdlib.h>      // malloc, abort
 
+#define _ZSt15get_new_handlerv _Py__ZSt15get_new_handlerv
+
 #define MI_IN_ALLOC_C
 #include "alloc-override.c"
 #undef MI_IN_ALLOC_C