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Remove comparision in constant conditions

This was a very idea because it is easier to detect
a zero or an one than a comparision

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -1161,7 +1161,7 @@

 	expect('(');

 	np = exp2cond(expr(), 0);

 	if (np->constant)

-		np = node(ONE, inttype, np, constnode(zero));

+		warn("conditional expression is constant");

 	expect(')');

 	return np;

--- a/cc1/tests/test006.c

+++ b/cc1/tests/test006.c

@@ -2,19 +2,22 @@

 name: TEST006

 description: Basic test for if

 output:

+test006.c:42: warning: conditional expression is constant

+test006.c:44: warning: conditional expression is constant

+test006.c:47: warning: conditional expression is constant

 G1	M	c

 F1

 X2	F1	main

 G2	F1	main	{

 -

-	j	L2	#I0	#I0	=I

+	j	L2	#I0

 	yI	#I1

 	j	L3

 L2

-	j	L4	#I0	#I0	=I

+	j	L4	#I0

 	j	L5

 L4

-	j	L6	#I1	#I0	=I

+	j	L6	#I1

 	j	L7	G1	MI	#I0	=I

 	yI	#I1

 	j	L8

@@ -52,4 +55,3 @@

 	}

 	return 1;

 }

-