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Check types in relational operators in pointers

Before this commit relational() was using bincode(), so
there was no any check of the types of the operands.
With this new change relational() does the same
than eq().

--- a/expr.c

+++ b/expr.c

@@ -95,7 +95,8 @@

 	case PTR: case ARY:

 pointer:

 		switch (op) {

-		case OEQ: case ONE:

+		case OLT: case OGT: case OGE:

+		case OLE:	case OEQ: case ONE:

 			if (t1 == ARY)

 				tp1 = mktype(tp1->type, PTR, NULL, 0);

 			else if (t1 != PTR)

@@ -339,7 +340,7 @@

 		default:  return np;

 		}

 		next();

-		np = bincode(op, inttype, np, shift());

+		np = arithmetic(op, np, shift());

 	}

 }