[Issue 3284] snn linked programs never release memory back to the OS

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=3284

--- Comment #8 from Walter Bright <bugzilla at digitalmars.com> ---
snn.lib uses the Win32 HeapAlloc and HeapFree routines for malloc/free:

https://github.com/DigitalMars/dmc/blob/master/src/HEAP32/malloc.c#L22

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