[pull] master from panda3d:master#11
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dlmalloc's default MORECORE is sbrk, which shares the program break with the system (glibc) allocator. Our MemoryHook lock and glibc's malloc lock are independent, so a Panda thread allocating through dlmalloc and another thread allocating through the system allocator can call sbrk() concurrently and corrupt the heap. Define HAVE_MORECORE 0 so dlmalloc uses mmap exclusively and never touches the program break.
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