Change 9893

Request Review
On a Windows debug build the /MT flag was used in addition to
the /MTd flag.  Basically harmless except the compiler issued
a warning for every file compiled.

Removed the use of the /MT flag in the jambase arena.  This
allows the Jamrules to properly set this flag as required.

Also when doing a Smart Heap debug build, duplicate symbols
in the Smart Heap library conflicted with the standard
Windows CRT library.  Adding a /FORCE to the link line solves
this problem.  This is a very narrow case and should not effect
builds without Smart Heap.

Jam must be rebuilt to remove the /MT and /MTd warning. Transferred from production
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