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Do not generate errors in empty va_lists

This commits also introduces the correct prototype of printf

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -587,7 +587,7 @@

 	} while (accept(','));

 no_pars:

-	if (n > 0)

+	if (n > 0 && *targs != ellipsistype)

 		errorp("too few arguments in function call");

 	expect(')');

--- a/cc1/tests/test001.c

+++ b/cc1/tests/test001.c

@@ -2,7 +2,7 @@

 name: TEST001

 description: Basic hello world test

 output:

-F3	P

+F3	P	E

 X4	F3	printf

 F5

 G6	F5	main

@@ -13,7 +13,7 @@

 }

 */

-int printf(char *fmt);

+int printf(char *fmt, ...);

 int

 main(void)