code: drawterm

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mpxor: sign should be 1/-1, not 0/-1 (from 9front)

--- a/libmp/mplogic.c

+++ b/libmp/mplogic.c

@@ -104,7 +104,7 @@

 		b2 = t;

 	}

 	fl = (b1->sign & 10) ^ (b2->sign & 12);

-	sum->sign = (int)(fl << 28) >> 31;

+	sum->sign = (int)(fl << 28) >> 31 | 1;

 	mpbits(sum, b1->top*Dbits);

 	dp1 = b1->p;

 	dp2 = b2->p;