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[cc1] Fix conmutative() with == and !=

Equality operators are full conmutative, so it is
not needed to negate the operator when we apply
the conmutative rule.

--- a/cc1/fold.c

+++ b/cc1/fold.c

@@ -365,9 +365,9 @@

 	case OGT:

 	case OGE:

 	case OLE:

+		*op = negop(*op);

 	case OEQ:

 	case ONE:

-		*op = negop(*op);

 	case OADD:

 	case OMUL:

 	case OBAND:

--- a/cc1/tests/test056.c

+++ b/cc1/tests/test056.c

@@ -27,7 +27,7 @@

 G13	I	F	"main

 {

 \

-	h	G9	M7	.V6	'P	#P2	+P	@K	gI	gN	#N0	!I

+	h	G9	M7	.V6	'P	#P2	+P	@K	gI	gN	#N0	=I

 }

 */