wm: 5551

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simplify and, make it work on Plan 9, (thanks mh!)

--- a/5551e.c

+++ b/5551e.c

@@ -13,9 +13,9 @@

 bool add_bit(bool a, bool b, bool *carry)

 {

-	bool out, temp = carry;

+	bool out, temp = *carry;

 	out = ((a ^ b) ^ temp);

-	carry = (((a ^ b) & temp) | (a & b));

+	*carry = (((a ^ b) & temp) | (a & b));

 	return out;

 }