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Using floor(.5+x) instead of lrint(x) for C90 compilers

--- a/src/mlp.c

+++ b/src/mlp.c

@@ -74,7 +74,7 @@

 	   x=-x;

 	   sign=-1;

 	}

-	i = lrint(25*x);

+	i = floor(.5+25*x);

 	x -= .04*i;

 	y = tansig_table[i];

 	dy = 1-y*y;