zend_ini: Make ZEND_INI_GET_ADDR() return a void* pointer

Since the actual type of the storage location is not known, a `void*` is more
appropriate and avoids explicit casts that are no more safe than the implicit
cast from `void*`.

Author: TimWolla

Zend/zend_ini.h

@@ -257,6 +257,6 @@ typedef struct _zend_ini_parser_param {
 # define ZEND_INI_GET_BASE() ((char *) ts_resource(*((int *) mh_arg2)))
 #endif
 
-#define ZEND_INI_GET_ADDR() (ZEND_INI_GET_BASE() + (size_t) mh_arg1)
+#define ZEND_INI_GET_ADDR() ((void*)(ZEND_INI_GET_BASE() + (size_t) mh_arg1))
 
 #endif /* ZEND_INI_H */