[Bug-glpk] LPX_FX is a special case of LPX_DB

[Abirami Meyyappan]

If the user supplies a row/column of type LPX_DB with lb == ub,
internally set its type as LPX_FX.  After all, according to the
former type, lb <= x <= ub, which implies that lb == ub is valid.
But, currently, this creates an error when solving the model.

BTW, Thank you for your excellent work on GLPK.  You have really
made linear/integer programming accessible to the world at large...

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