making lua 4.0 report block size to realloc

["Cameron Tofer" <camtofer@...>]

Hi,    I'd like to change luaM_realloc to specify the size of the existing
block that's changing so I can use a memory manager that uses free lists
rather than block headers.  I made a small attempt at changing the source
until I ended up at close_func in lparser.c.  Would this be a difficult task
to complete?  Is this easier in 5.0?

thanks,
cam