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[cc1] Fix function alike macro without arguments

This case was not tested and there was an error parsing
this case, because we were checking yytoken, but in
this case we are still in '(', because cpp.c:parameter
pass to the next token before checking.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -163,7 +163,9 @@

 	n = 0;

 	argp = buffer;

 	arglen = INPUTSIZ;

-	if (yytoken != ')') {

+	if (ahead() == ')') {

+		next();

+	} else {

 		do {

 			*listp++ = argp;

 			parameter();

--- /dev/null

+++ b/cc1/tests/test064.c

@@ -1,0 +1,32 @@

+/* See LICENSE file for copyright and license details. */

+

+/*

+name: TEST064

+description: Test function alike macro without parenthesis

+error:

+output:

+G5	I	F	"main

+{

+\

+S1	"	#N2	#N1

+M2	I	"f	#N0

+A6	S1	"s

+	A6	M2	.I	#I0	:I

+	h	A6	M2	.I

+}

+*/

+

+#define x f

+#define y() f

+

+typedef struct { int f; } S;

+

+int

+main()

+{

+	S s;

+	

+	s.x = 0;

+	return s.y();

+}

+