msvcr90: realloc can move memory block.

[Alexander Morozov]

_recalloc contains such code:

     ret = realloc(mem, size);
     if(!ret) {
         *_errno() = ENOMEM;
         return NULL;
     }

     if(size>old_size)
         memset((BYTE*)mem+old_size, 0, size-old_size);

Here realloc can return pointer ret which is not equal to mem.
In such case memset corrupts memory.
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