[MLton-commit] r4785

[Vesa Karvonen]

Reorganized the MLB file and used the SML_COMPILER variable to refer to
compiler specific files.  Added an empty workarounds.mlb for MLton.  This
was done in preparation for MLKit port so that both compilers can share
the same MLB files.

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A   mltonlib/trunk/com/ssh/extended-basis/unstable/detail/mlton/workarounds.mlb
U   mltonlib/trunk/com/ssh/extended-basis/unstable/extensions.mlb

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