Add rint() to /port, remove from qnx/.

src/port/rint.c

@@ -0,0 +1,37 @@
+/*-------------------------------------------------------------------------
+ *
+ * rint.c
+ *	  rint() implementation
+ *
+ * Copyright (c) 1999, repas AEG Automation GmbH
+ *
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/port/rint.c,v 1.1 2003/05/09 16:26:29 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "c.h"
+#include <math.h>
+
+double
+rint(double x)
+{
+	double		f,
+				n = 0.;
+
+	f = modf(x, &n);
+
+	if (x > 0.)
+	{
+		if (f > .5)
+			n += 1.;
+	}
+	else if (x < 0.)
+	{
+		if (f < -.5)
+			n -= 1.;
+	}
+	return n;
+}