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     The functions in the _heapmin family minimize the heap by
     releasing unused memory in the heap to the operating system.
 
     The various _heapmin functions release unused memory in these
     heaps:
 
     Function      Heap Minimized
 
     _heapmin      Depends on data model of program
 
     _bheapmin     Based heap specified by seg value;
                   _NULLSEG specifies all based heaps
 
     _fheapmin     Far heap (outside default data segment)
 
     _nheapmin     Near heap (inside default data segment)
 
     With large data models (that is, compact-, large-, and huge-model
     programs), _heapmin maps to _fheapmin. In small data models
     (tiny-, small-, medium-model programs), _heapmin maps to
     _nheapmin.
 
     Based-heap segments are never freed (i.e., unlinked from the
     based-heap list and released back to the operating system) by the
     _bheapmin function. The _bfreeseg function is used for that
     purpose.
 
     Return Value
 
     The _heapmin functions return 0 if the function completed
     successfully, or -1 in the case of error.
                                    -♦-